How to Clean a Computer Screen or Monitor Without Damaging It
Every month somebody carries a monitor into my Somerville shop with a "screen problem" that turns out to be a cleaning injury: a cloudy patch where window cleaner ate the anti-glare coating, or a haze of fine scratches from a paper towel that seemed harmless. Screens are tougher than they look in most ways and fragile in exactly one: the coating on the surface. Clean it with the wrong chemical once and the damage is permanent. This guide covers what Apple, Dell and Microsoft actually say you can put on a display, the two-cloth method I use on customer machines every day, what changes for laptops, touchscreens and OLED panels, and how to tell whether the spot you're scrubbing is dirt or damage.
In this guide
- Why screens are so easy to ruin (the coating problem)
- What should never touch a computer screen
- What Apple, Dell and Microsoft say to use
- The two-cloth method (five minutes)
- Matte, glossy, touchscreen, laptop and OLED: what changes
- Keyboard and mouse while you're at it
- The spot won't come off: dirt or damage?
- What to keep in the drawer
- Frequently asked questions
- Sources
Why Screens Are So Easy to Ruin
You're not cleaning glass. You're cleaning a chemical coating a few microns thick that sits on top of the glass.
Almost every monitor and laptop display made in the last fifteen years has at least one coating on its surface. Matte screens have an anti-glare layer that scatters reflections. Glossy screens and most laptops have an anti-reflective layer, and anything with a touchscreen adds an oleophobic (oil-repelling) layer so fingerprints wipe off. These coatings are what make the picture look good in a bright room, and they are also the part that dies first.
Ammonia, alcohol in high concentrations, acetone, bleach and peroxide all attack these layers. The damage doesn't show up as a scratch. It shows up as a milky film, a patch that looks permanently smudged no matter how much you wipe it, uneven dark shading, or in bad cases the coating physically peeling in flakes. Dell's own support article on cleaning damage lists exactly those symptoms: "color fading, milky film on the monitor, deformation, uneven dark shade, and screen surface peeling." Once the coating is gone, the only fix is a new panel, and on a monitor that usually means a new monitor.
The second way people ruin screens is mechanical. Paper towels, tissues and napkins are made of wood fiber, which is abrasive at the microscopic level. Drag one across a screen with a little dust on it and you get the faint swirl-mark haze you see on older office monitors. The third way is pressure. An LCD is a liquid crystal layer sandwiched between two thin sheets; push hard on it while scrubbing a stubborn spot and you can bruise the crystal permanently.
What Should Never Touch a Computer Screen
This list is short and every item on it is something I've seen ruin a display.
- Window cleaner (Windex and its cousins). Ammonia strips anti-glare and anti-reflective coatings. This is the number one screen killer I see, because it's sitting under everyone's sink.
- Paper towels, tissues, napkins, toilet paper. Wood-fiber abrasives. They also shed lint into the bezel gap.
- Straight rubbing alcohol at 91 percent or higher, acetone, nail polish remover, thinner. Solvents cloud coatings and can wick into the panel edges.
- Bleach, hydrogen peroxide, "kills 99.9 percent" bathroom sprays. Every manufacturer's care page names these specifically.
- Anything sprayed directly onto the screen. Liquid runs down, pools in the bottom bezel, and wicks into the panel and the electronics behind it. Dell describes it plainly: the liquid can "roll down to the bottom of the panel and corrode the electronics resulting in permanent damage." Spray the cloth, never the screen.
- Compressed air aimed at the panel. Dell lists it with the things that damage monitors, and a can tilted at an angle spits freezing propellant. It's fine for keyboards and vents.
- Your dry sleeve on a dusty screen. Dragging grit across the coating is how micro-scratches happen. Dust first, then wipe.
- Magic erasers and anything "scrubbing." They're melamine foam, which is a very fine abrasive. They'll take a coating off in one pass.
What Apple, Dell and Microsoft Say to Use
The three companies don't fully agree with each other, which is why the internet argues about alcohol. Here's what each one actually publishes.
| Manufacturer | Recommended | Allowed for tough smudges | Named as harmful |
|---|---|---|---|
| Apple (Mac displays and notebooks) | Soft, lint-free cloth dampened with water only | Cloth moistened with 70 percent isopropyl alcohol; 70 percent isopropyl wipes, 75 percent ethyl alcohol wipes or Clorox Disinfecting Wipes on hard, nonporous surfaces. Nano-texture glass gets only the polishing cloth Apple supplies. | Aerosol sprays, solvents, abrasives, hydrogen peroxide, bleach, window cleaners, household cleaners, anything with acetone. Never spray directly, avoid moisture in openings. |
| Dell (laptops, desktops, keyboards) | Microfiber cloth moistened with a 70 percent isopropyl / 30 percent water mix, wrung out; wipe an LCD in one direction, top to bottom | Display-safe glass cleaners after the main clean, provided they are ammonia-free | Bleach and chlorine cleaners, peroxides, acetone, paint thinner, benzene, toluene, ammonia, ethyl alcohol. Any material other than microfiber. |
| Dell (monitor-specific cleaning damage article) | Soft clean cloth with water, or a screen-cleaning tissue or solution made for the monitor | None listed | Detergents of any kind, benzene, thinner, ammonia, abrasive cleaners, alcohol, compressed air. Liquid sprayed onto the panel. |
| Microsoft (Surface screens) | Screen-cleaning wipe or a soft, dry, lint-free cloth | Cloth dampened with water or a 70 percent or weaker isopropyl solution | Glass cleaner and other chemical cleaners, chlorine, bleach, hydrogen peroxide, disinfectant wipes on any touchscreen. Never spray or pour liquid on the device. |
Notice the overlap. Every one of them agrees on a soft lint-free cloth, water, no spraying, and no ammonia, bleach or peroxide. The only real disagreement is alcohol on the panel itself, and even there the allowed concentration is 70 percent or less, not the 91 percent bottle from the pharmacy.
My rule at the bench, which keeps every manufacturer happy: distilled water on microfiber for the screen, 70 percent isopropyl on microfiber for the keyboard, mouse and case. If a smudge on the screen won't move with water, I'll use a barely damp 70 percent cloth on a Mac or a Surface, because their makers say it's fine. On a monitor whose care page I can't find, I stay with water. The screen coatings on cheap monitors are the ones most likely to react badly, and they're also the ones nobody documents.
The Two-Cloth Method
Five minutes, start to finish. It works on desktop monitors, laptop screens, all-in-ones and TVs.
Turn it off and unplug it
A dark screen shows every smudge and fingerprint, so you can see what you're doing. It also means no live electronics near a damp cloth, and on a laptop it stops you from accidentally typing or dragging windows while you wipe.
Let a warm screen cool for a few minutes first. Cleaning a warm panel is the number one cause of streaks, because the water evaporates before the cloth can lift the residue.
Dry pass with the first cloth
Take a clean, dry microfiber cloth and sweep the screen gently top to bottom, then side to side, with no pressure at all. You're lifting loose dust so it can't get dragged around in the wet pass. If the cloth picks up visible grit, shake it out before continuing.
Damp pass with the second cloth
Dampen a second microfiber cloth with distilled water and wring it until it's barely damp; it should never drip. Wipe in broad, gentle strokes, top to bottom the way Dell describes. Let the cloth do the work; if a mark doesn't come off with light passes, more pressure won't help and can bruise the panel. For a greasy fingerprint that won't shift, follow your manufacturer's rule from the table above (a 70 percent isopropyl cloth on a Mac or Surface, water only on an undocumented monitor).
Distilled water matters more than it sounds. Tap water leaves mineral spots as it dries, especially in the harder water we get across central New Jersey.
Edges, corners and the bezel gap
Wrap the damp cloth over one finger to get into the corners. For the thin crease where the panel meets the bezel, use a dry cotton swab; anything wet there can wick behind the panel. Wipe the plastic bezel itself with the same damp cloth.
Dry-cloth finish and wait
Go back over the screen with the dry cloth to pick up any remaining moisture and kill streaks. Then let it air-dry for a minute before plugging it back in. Dell's guidance is that there should be no visible moisture anywhere before power goes back on.
Matte, Glossy, Touchscreen, Laptop and OLED: What Changes
The method is the same. The amount of liquid and pressure you can get away with is not.
Matte (anti-glare) monitors
The anti-glare layer is slightly textured, which is why it hides reflections and also why it holds onto grime. Matte screens need the damp pass more often than glossy ones, and they show ammonia damage fastest. Stick to water.
Glossy screens and all-in-ones
Smooth glass front, so fingerprints show more but wipe off more easily. Streaks are the main annoyance; the dry-cloth finish handles them. iMacs and many all-in-ones have the glass bonded to the panel, so any liquid that gets under the edge is a repair, not a cleaning.
Touchscreens
The oleophobic coating is what makes fingerprints wipe off with a dry cloth, and it wears away with harsh chemicals. Microsoft's Surface guidance says no disinfectant wipes on any touchscreen for exactly that reason. A dry microfiber pass every day or two does most of the work; the damp pass is for when that stops being enough.
Laptop screens
Laptop panels are thinner and flex under your hand, so use even less pressure and even less water, and support the lid with your other hand while you wipe. Everything else is the same. There's a dedicated walkthrough in my guide to cleaning a laptop screen, and while the microfiber is out, the vents deserve attention too: a clogged fan cooks laptops all summer, and cleaning the laptop fan is the other five-minute job that prevents a much more expensive problem.
OLED monitors and TVs
OLED panels have no backlight and the organic layer sits close to the surface, so the manufacturers are even more insistent about no solvents and no pressure. Dry microfiber first, distilled water only if you must, and never let liquid reach the edges.
Apple nano-texture glass
If you paid extra for the nano-texture option on a Studio Display, Pro Display XDR, iMac or MacBook Pro, the etched surface needs the polishing cloth Apple supplies and nothing else. Apple publishes a separate care page for it, linked in the sources.
Keyboard and Mouse While You're At It
Whatever you're imagining living in your keyboard, it's more. Same session, five more minutes, and the rules here are looser because keycaps are plastic, not coated glass.
Unplug it, or power the laptop off
No typing mid-clean, and no chance of holding a key down long enough to do something you'll regret.
Flip and tap
Hold a desktop keyboard upside down over the trash and tap the back firmly. On a laptop, tilt it to about 75 degrees over the trash and tap gently around the palm rest. You'll be surprised.
Compressed air in the gaps
Short bursts, at an angle, so debris blows out rather than deeper. Keep the can upright so it doesn't spit propellant; the liquid is cold enough to crack plastic and leave residue.
Wipe the keycaps and mouse
Microfiber cloth barely dampened with 70 percent isopropyl alcohol. It cuts skin oil and takes the shine off your most-used keys. Wipe the mouse the same way, including the underside around the sensor. This is also the step where a disinfecting wipe is appropriate if someone in the house has been sick.
On a laptop, don't let alcohol pool between keys. A damp cloth, not a wet one.
Swab the trenches
A cotton swab with a little alcohol run along the rows between keys picks up what the air missed.
If a key stopped working or started sticking and cleaning didn't bring it back, that's mechanical rather than dirt. My guides on fixing a stuck key and what to do when a keyboard stops working pick up where the compressed air leaves off. A laptop keyboard that got a drink spilled in it is a different situation entirely: unplug it, power it off, and read my post on spills, drops and cracked screens before you do anything else.
The Spot Won't Come Off: Dirt or Damage?
A good cleaning is sometimes a reveal. Here's how to read what's left.
| What you see after cleaning | What it probably is | What to do |
|---|---|---|
| Tiny, sharp-edged black dot that never changes | Dead pixel (all three subpixels off) | Livable if it's alone. Dell's laptop guideline at 1600×900 or higher allows zero bright pixels and up to five dark subpixels before a panel qualifies for warranty replacement; check your maker's pixel policy. See my dead pixels guide. |
| Tiny bright white, red, green or blue dot | Stuck or bright pixel | Sometimes recovers on its own; never press on it. Same pixel-policy rules apply. |
| Soft-edged dark blotch, often after the laptop was closed on something | Pressure mark in the liquid crystal layer | Doesn't clean off and pressing spreads it. Panel replacement if it's in your working area. Details in my black spots guide. |
| Dark area with irregular edges that's bigger than it was last week | Spreading liquid crystal damage from a cracked inner layer | Always spreads. Panel replacement. |
| Milky haze or cloudy patch that's the same at any angle | Coating damage from a cleaner | Permanent. On a laptop, a new panel; on a monitor, usually a new monitor. |
| Faint swirl marks visible only in reflections | Micro-scratches from paper towels or a gritty cloth | Permanent but cosmetic. Stop using paper products. |
| Thin line top to bottom or side to side | Panel driver or display cable failure | Not a cleaning issue. See my guide to lines on a laptop screen. |
| Faint ghost of a toolbar or logo that stays put | Image retention or burn-in (worst on OLED) | Mild retention often fades; true burn-in is permanent. Use a screen saver and auto-hide static toolbars. |
The tell for all of these: dirt sits on top of the image and looks the same whether the screen shows white or black. Damage sits inside the image and changes with what's displayed behind it.
What to Keep in the Drawer
You don't need a screen-cleaning kit. You need four cheap things.
- Microfiber cloths, at least two, ideally four. One pair for the screen, one pair for everything else. Wash them in the machine with no fabric softener (softener coats the fibers and they stop grabbing dust) and let them air-dry.
- Distilled water. A gallon from the grocery store lasts a year. Keep a little in a small spray bottle labeled so nobody mistakes it, and spray the cloth, not the screen.
- 70 percent isopropyl alcohol. For keyboards, mice and cases, and for tough smudges on a Mac or Surface display where the manufacturer allows it. Not the 91 percent bottle.
- Cotton swabs. For the bezel crease and between keys.
Commercial screen-cleaning sprays are fine if the label says ammonia-free and alcohol-free, but they're mostly distilled water with a surfactant and a markup. The cloths are the part that matters.
Frequently Asked Questions
Can I use Windex on a computer screen?
No. Window cleaners contain ammonia, and Apple, Dell and Microsoft all list ammonia-based and household glass cleaners as products that damage display coatings. The damage shows up as a milky haze, faded color or peeling that does not come off. Use distilled water on a microfiber cloth instead.
Can I use rubbing alcohol to clean a monitor?
It depends on the manufacturer. Apple and Microsoft allow a cloth moistened with 70 percent isopropyl alcohol on their displays, and Dell recommends a 70/30 isopropyl and water mix on a microfiber cloth for its equipment, but Dell's monitor-specific guidance warns against alcohol on monitor panels. Check your model's care page. Distilled water is safe on every screen.
Can I use eyeglass cleaner on a computer monitor?
Usually, as long as the label says it is ammonia-free and safe for coated lenses. Spray it on the cloth, never on the screen. Distilled water on microfiber does the same job with zero risk.
Are disinfecting wipes safe for a computer screen?
Apple says 70 percent isopropyl wipes and Clorox Disinfecting Wipes are fine on the hard, nonporous surfaces of its products, including displays. Microsoft says not to use disinfectant wipes on any Surface touchscreen, and Dell warns against bleach and peroxide products. If you are unsure, disinfect the keyboard and mouse with the wipe and do the screen with distilled water.
Why does my screen streak every time I wipe it?
The cloth is too wet, the cloth is dirty, or the screen is warm. Wring the cloth until it is barely damp, wash microfiber cloths without fabric softener, and clean the screen only after it has cooled. Finish with a dry-cloth pass.
I cleaned the screen and the spot is still there. What is it?
If a mark does not move with cleaning it is inside the panel, not on it. A sharp pinpoint dot is a dead or stuck pixel, a soft-edged blotch is a pressure mark, and a dark area that grows over days is spreading liquid crystal damage. None of those clean off, and pressing on them makes them worse.
How often should I clean my monitor?
A dry microfiber pass once a week keeps dust from building into a film. A damp cleaning every month or two is plenty for a desktop monitor. Laptops and touchscreens that get handled need it more often.
Is compressed air safe for cleaning a screen?
Not on the screen itself. Dell lists compressed air among the things that damage monitors, and a can held at an angle can spit propellant onto the panel. Save it for the keyboard and vents, keep the can upright, and use short bursts.
Sources
- Apple Support, How to clean your Apple products
- Apple Support, How to clean your nano-texture Apple display
- Dell Support, Guidance for Keeping Your Dell Technologies Equipment Clean
- Dell Support, Damage to Monitor Through Incorrect Cleaning Methods
- Dell Support, Dell Display Pixel Guidelines
- Microsoft Support, Clean and care for your Surface
- HP Support, HP PCs and Monitors - Damaged screen, LCD, or display
Cleaning Uncovered a Real Problem?
Lines under the glass, a bruise that won't wipe away, a crack hiding in the corner: those are repairs, not smudges. Bring it to my shop in Somerville. The $75 diagnostic is credited toward any repair I do, and first-time customers get $25 off.
📞 (908) 428-9558Dave's Computers · 75 N Bridge St, Somerville, NJ 08876 · Mon to Fri 10am to 5pm, Sat 9am to 2pm · Walk-ins welcome, no appointment needed