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 fine scratches from a paper towel that seemed harmless. Screens are tougher than they look in some ways and far more delicate in exactly one: the coating on the surface. Clean with the wrong chemical once and the damage is permanent.
Here's the method we use on customer machines every day. It costs almost nothing and works on desktop monitors, laptop screens, and TVs alike.
Window cleaner (Windex and friends). Ammonia strips anti-glare and anti-reflective coatings. This is the number one screen killer.
Paper towels, tissues, napkins. Wood-fiber products are sandpaper at the microscopic level. They're how screens get that faint swirl-mark haze.
Straight rubbing alcohol or acetone. Solvents cloud coatings and can creep into panel edges.
Anything sprayed directly onto the screen. Liquid runs down, pools in the bottom bezel, and wicks into the panel and electronics. Spray the cloth, never the screen.
Your dry shirt sleeve on a gritty screen. Dragging dust across glass is how micro-scratches happen — dust first, then wipe.
Pressure is the part people get wrong: pressing hard on an LCD distorts the liquid crystal layer and can permanently bruise the panel. If a mark doesn't come off with gentle passes, it's probably not dirt — more on that in the FAQs.
Whatever you're imagining living in your keyboard, it's more. Same session, five more minutes:
If a key stopped working or started sticking and cleaning didn't bring it back, that's mechanical — our guides on fixing a stuck key and what to do when a keyboard stops working pick up where the compressed air leaves off.
Everything above applies, with less liquid and even less pressure — laptop panels are thinner and flex under your hand. We keep a dedicated walkthrough for cleaning a laptop screen, and while you have the microfiber 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 hundred-dollar problem.
Usually safe — most are alcohol- and ammonia-free — but check the label for "safe for coated lenses." Distilled water on microfiber remains the no-questions-asked option.
Fine for the keyboard, mouse, and desk; keep them off the screen. Most contain alcohol or quaternary compounds that haze coatings over repeated use. If someone's been sick, disinfect the peripherals and do the screen with the two-cloth method.
If it doesn't move with cleaning, it's in the panel, not on it: stuck or dead pixels, pressure bruises, or the start of panel failure. Dark specks and clusters are covered in our guides to dead pixels and black spots on screens — worth reading before assuming the worst.
Either the cloth is saturated (wring it further), the cloth is dirty (wash your microfibers, no fabric softener — softener ruins them), or you're cleaning a warm screen. Cool screen, barely-damp cloth, dry-cloth final pass: no streaks.
Sometimes a good cleaning is a reveal: lines under the glass, a bruise that won't wipe away, a crack hiding in the corner. Those are repairs, not smudges — laptop screen replacement is one of the most routine jobs at our bench, usually turned around in a few days. And if the whole machine deserves the spa treatment — interior dust-out, thermal service, tune-up — that's a standing service at our Somerville computer repair shop; the $75 diagnostic applies to problems, not cleanings, and gets credited toward any repair we do.
Dave's Computers is at 75 North Bridge Street, Somerville, NJ 08876, in downtown Somerville just off Main Street.
From I-287, take the exit for US-202/206 toward Somerville, follow signs into downtown, and turn onto North Bridge Street from Main Street. From the Route 22 corridor in Bridgewater or Bound Brook, head south on Route 202/206 or Adamsville Road into downtown. We're a few minutes from the Somerville Circle. Street parking is available on North Bridge Street, with municipal lots within a short walk.
We're a drop-off shop — no appointment needed. Hours: Monday–Friday 10am–5pm, Saturday 9am–2pm. Sticky spill in a keyboard or a screen that revealed something scary? Bring it by — some things shouldn't wait.
First time in? Mention this article at drop-off and we'll take $25 off your first repair. The $75 diagnostic is still credited toward the work. One per customer, new customers only.
Or call 908-428-9558 — if you're not sure whether that mark is dirt, a dead pixel, or damage, describe it and we'll give you an honest read before you drive over.