How to Remove Scratches from Glass: Easy DIY Methods

Scratched glass looks like permanent damage, but many surface scratches can be polished out at home with inexpensive materials. Knowing how to remove scratches from glass depends on depth — your fingernail catches on deep scratches but glides over shallow ones. Shallow surface scratches come out with toothpaste or baking soda. Deeper scratches require cerium oxide compounds. Scratches you can see on both sides of the glass usually cannot be repaired without professional resurfacing.

Assessing Scratch Depth First

Clean the glass thoroughly and dry it. Run a fingernail across the scratch at a 90-degree angle. If your nail does not catch, the scratch is shallow and DIY-repairable. If it catches lightly, a cerium oxide polish should handle it. If your nail drops into the scratch, it is too deep for home repair and will likely need professional resurfacing or replacement.

Use a strong flashlight held at a low angle to inspect the scratch fully. Multiple parallel scratches, typical from sliding keys or tools across glass, usually polish out together.

The Toothpaste Method for Shallow Scratches

Use a non-gel, non-whitening toothpaste — the classic paste formula contains fine abrasives that act like micro-polish. Apply a pea-sized amount with a soft microfiber cloth and rub in circular motions for 30 to 60 seconds. Wipe clean with a damp cloth and inspect.

Light scratches on phone screens, eyeglasses, and watch crystals often disappear after 2 to 3 applications. Toothpaste will not damage the glass or its coatings if you rinse thoroughly within 5 minutes.

Baking Soda Paste for Slightly Deeper Marks

For scratches that resist toothpaste, mix 2 tablespoons baking soda with 1 tablespoon water into a thick paste. Apply with a microfiber cloth and work the area in tight circles for 60 to 90 seconds. The mild abrasive blends shallow scratches into the surrounding surface.

Rinse with distilled water to avoid leaving mineral streaks. Dry with a clean microfiber and reassess under angled light. Repeat if needed, but do not exceed three treatments in one session — aggressive rubbing can introduce new micro-scratches.

Cerium Oxide for Moderate Scratches

Cerium oxide is the professional standard for glass polishing. A kit like the GP-Pro Glass Polishing Kit at $35 to $60 includes felt pads and powder that removes scratches a fingernail catches on. Mix the powder with water to a sour-cream consistency, apply to a felt wheel on a drill at 1,500 to 2,500 RPM, and polish the area.

Keep the wheel moving to avoid heat buildup that could crack the glass. Keep the surface wet with a spray bottle throughout the process. Expect to spend 15 to 30 minutes per 6-inch scratch area, inspecting progress every few minutes.

Removing Scratches from Car Windshields

Windshield scratches are trickier because of the laminated safety glass. Wiper-blade scratches — parallel arcs on the driver’s side — are the most common. Use a cerium oxide kit designed for automotive glass, such as Rain-X Glass Polishing Compound at $20, with a dual-action polisher on a low speed setting.

Deep chips and cracks in windshields are not DIY-friendly. Call a glass repair service — a resin chip repair runs $60 to $120 and preserves the safety rating of the laminated layer.

Polishing Out Scratches on Mirrors

Mirror scratches are harder to repair because the reflective coating sits on the back of the glass. Surface scratches on the front respond to toothpaste or cerium oxide. Scratches that have penetrated to the silver backing show as black lines and cannot be polished out — they require re-silvering or replacement.

For a decorative mirror with backside damage, a silver-look spray paint applied to the back can hide minor coating damage at $15 for a can of Krylon Mirror Spray. Mirror replacement is usually $10 to $30 per square foot for similar-sized cuts.

Eyeglasses and Watch Crystals

Modern eyeglass lenses often have anti-reflective and UV coatings that can be damaged by aggressive polishing. Start with toothpaste only, applied very gently. If scratches remain, take them to an optician — coating damage is usually permanent and may require lens replacement at $40 to $200.

Watch crystals made of mineral glass polish easily with cerium oxide or even toothpaste. Sapphire crystals are harder and require diamond paste — this is a job for a watchmaker at $30 to $80 rather than a DIY project.

Phone and Tablet Screen Scratches

Most modern phone screens use Corning Gorilla Glass or similar chemically-strengthened glass that resists scratches better than standard glass but polishes worse. Shallow scratches respond to toothpaste. Anything deeper is usually better covered with a tempered glass screen protector at $10 to $20 rather than polished.

Do not use cerium oxide on phone screens — the oleophobic coating will be stripped, leaving the screen feeling sticky and more prone to fingerprints. Screen replacement through a repair shop runs $80 to $400 depending on the model.

What Not to Try

Avoid metal polishing compounds designed for stainless steel — they contain abrasives too harsh for glass and can leave permanent haze. Sandpaper, even ultra-fine grits, is too aggressive for most home repairs and usually makes the damage worse.

Avoid rubbing compounds labeled for automotive paint. Those formulations are tuned for clear coat, not silica. They can strip tints and coatings on glass without removing the scratch.

When Professional Repair Makes Sense

If the glass is tempered (required for shower doors, patio doors, and low windows by code), do not attempt aggressive polishing. Deep polishing can weaken the temper and cause the glass to shatter later. Call a glass specialist for any scratches on tempered glass that are not purely superficial.

For antique mirrors, stained glass, and high-value art glass, professional restoration preserves the piece’s value. A repair specialist charges $75 to $200 per hour but handles damage that would ruin the piece in amateur hands.

Preventing Future Scratches

Most household glass damage comes from abrasive cleaning. Ditch paper towels in favor of microfiber cloths for windows and mirrors. Avoid scouring pads on glass stovetops — use a dedicated cerium-oxide based cleaner like Bar Keepers Friend cooktop cleaner at $5 a bottle. Keep keys, tools, and jewelry away from phone screens; a simple case with a raised lip protects the screen from most everyday impacts.

For car windshields, inspect wiper blades every 6 months and replace at the first sign of streaking. Worn wiper rubber is the single most common source of scratched windshields. A set of premium blades like Bosch ICON at $40 a pair is cheap insurance against $300 polish jobs down the road.