How to remove scratches from glass (and when to replace it)

A scratch across a glass shower screen, window, mirror or tabletop is one of those flaws your eye is drawn to every time. Before you resign yourself to replacing the whole panel — which is expensive and disruptive — it’s worth knowing that many scratches can be polished out. This guide explains what can and can’t be removed, what’s realistic to attempt yourself, and when professional glass polishing is the smarter, cheaper option.

First, work out how deep the scratch is

The single most useful test costs nothing: run your fingernail gently across the scratch. If your nail glides over it or barely catches, it’s a light surface scratch — the kind that can usually be polished out. If your nail clearly drops into and catches in the groove, it’s a deep scratch or gouge that generally can’t be fully removed. And if it’s a crack or a chip rather than a scratch, polishing won’t help at all, because those affect the structural integrity of the glass and mean replacement. Knowing which category you’re in sets realistic expectations.

What can be polished out

Light to moderate surface scratches on most glass — windows, doors, shower screens, mirrors and tabletops — can typically be improved or removed with professional polishing, which uses a fine abrasive compound (often cerium oxide) and careful technique to gently level the surface around the scratch. The key word is careful: done too aggressively or unevenly, polishing can create a visible distortion or a “lens” effect that’s worse than the original scratch. That’s why patience and the right method matter.

What about DIY?

You’ll find DIY glass-polishing kits and home remedies (toothpaste, baking soda) online. For a very light, small scratch on a low-value item, a gentle attempt with a proper cerium oxide kit may help. But there are real risks: uneven pressure creates distortion, the wrong compound can haze the glass, and on a large or fitted panel a botched attempt can leave you worse off. For anything valuable, large, or fitted — especially shower screens and windows — professional polishing is the safer route.

Not every mark is a scratch

It’s worth checking what you’re actually dealing with, because the fix differs. Hard-water spotting and light etching on shower screens look like damage but may respond to specialist cleaning rather than polishing. Cloudy patches on the inside of double-glazing are a sealed-unit failure, not a scratch. And black marks creeping in from the edge of a mirror are de-silvering, which needs replacement. A quick photo lets a professional tell you which problem you have.

Why repair usually beats replacement

Polishing avoids the cost of new glass plus the labour of removal, disposal and re-fitting — which is significant for large panels and made-to-measure shower screens that have to be templated and fabricated. It’s also faster and far less disruptive, with no waiting around for a replacement and no living with a gap in the meantime. For most surface scratches, it’s simply the sensible first step; replacement is the fallback for damage that genuinely can’t be polished.

Frequently asked questions

Can a deep scratch be removed? Usually not fully — deep gouges that catch a fingernail generally can’t be polished out, and we’ll tell you honestly before starting.

Will polishing distort the glass? Not when done properly and patiently; the risk of distortion is exactly why careful technique matters and why DIY on big panels is risky.

Is it cheaper than replacing? For most panels, yes — particularly large windows and fitted shower screens.

Can you treat cloudy or etched shower glass? Sometimes — light etching and hard-water marks may respond to treatment; send a photo and we’ll assess.

The bottom line

Do the fingernail test: light surface scratches can usually be polished out, deep gouges and cracks generally can’t. For anything valuable or fitted, professional polishing is safer and far cheaper than replacement.

Got a scratched panel? See our glass scratch repair service. Send us a photo for an honest assessment and quote.

Preventing scratches in the first place

Once you’ve dealt with a scratch, a little care keeps new ones away. On shower screens, squeegee after each use and clean with soft cloths rather than abrasive pads or scouring powders, which are a common cause of fine scratching. On glass tabletops, use coasters and placemats and lift objects rather than dragging them. For mirrors and windows, avoid gritty cloths and don’t let hard-water spots build up, as aggressive later cleaning to remove them can mark the surface. Most everyday glass scratches come from abrasive cleaning or dragging grit across the surface, so gentle habits go a long way.

Hard-water marks vs true scratches

A lot of what looks like scratching on shower glass in Singapore is actually mineral deposit and light etching from hard water, not a physical scratch at all. The distinction matters because the fix is different: mineral spotting often responds to the right cleaning treatment, whereas a true scratch needs polishing. If you’re not sure which you have, the fingernail test helps — deposits sit on the surface and can often be felt as a film, while scratches are grooves in the glass. A photo lets us tell you which problem you’re dealing with and the most cost-effective way to treat it.