If you prefer a quicker solution, remember that most computers and tablets purchased in the last few years likely have LED or LCD screens. According to Joe Silverman of New York Computer Help, these screens are vulnerable to damage from window cleaner and high-concentration alcohol.

[Related: A comprehensive guide to spring cleaning your computer]

Damage to this protective layer is serious.

“Beneath that layer lies the sensitive electronics,” Silverman explains. “Liquids penetrating this defense can severely impact the sensors.”

Touchscreens present an even greater challenge. On devices like the Microsoft Surface, the display is the primary input method, making it extremely sensitive. Harsh cleaners or high pressure can irreparably damage the top layer.

Modern laptops often boast sleek, lightweight designs, which means thinner screens and less protection for the internal components.

The Right Way to Clean Your Computer Screen

Cleaning your screen is simple: use a dust-free cloth (microfiber is ideal) and a few drops of water.

Power down your computer and unplug the charger. This prevents electrical surges and makes it easier to spot dirt.

Apply a couple of drops of water to your cloth. Avoid paper towels or clothing; microfiber is best. Even soft cloths can cause micro-abrasions when dry. The moisture helps lift dust, particles, and grease.

Clean using gentle circular motions, starting from the center and moving outward to avoid streaks. If you see water droplets, you've used too much water. Gently blot excess water with an absorbent cloth.

For stubborn grime, Silverman suggests using isopropyl alcohol (70% or lower). “The percentage is crucial,” he emphasizes. “Higher concentrations are only suitable for non-sensor components.” Apply alcohol to the cloth, never directly to the screen.

Screen Care: A Parallel to Skincare

Like sun damage, screen damage is cumulative. Excessive pressure, harsh cleaners, and frequent cleaning all contribute to damage.

While you might get away with using strong cleaners occasionally, repeated use will eventually cause visible damage.

“You might see discoloration, lines (vertical and horizontal), or a rainbow effect,” Silverman notes. “Sometimes, you’ll see liquid trapped behind the screen.”

Unfortunately, this type of damage is irreversible; screen replacement is the only solution.

Preventing dirt buildup is the best cleaning strategy. For laptops, cover the keyboard with a microfiber cloth before closing it. For touchscreens, wash and dry your hands thoroughly before use to avoid transferring residue to the screen.

Wet hands can also damage non-touchscreen computers. Silverman frequently sees devices ruined by hand sanitizer leaking through the keyboard.

Cleaning Your Phone Screen

Phone screens are generally more durable than computer screens.

[Related: Best monitors for home offices]

Silverman explains that many iPhones and Samsung phones use a single, thick piece of glass with fused LCD layers, making them more resistant to damage. However, if using alcohol, stick to 70% or lower concentration, a soft cloth, and gentle pressure.

Exercise caution around charging ports; water can damage internal electronics. While newer models offer liquid resistance, it's best to avoid unnecessary risk.

Replacing a damaged screen is expensive and inconvenient. By following these tips, you can protect your devices and avoid costly repairs.

This story has been updated. It was originally posted on October 13, 2021.

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