Rinse the lenses under lukewarm running water first, then clean them with a small amount of mild, lotion-free soap on your fingertips, and dry with a clean cotton or microfibre cloth. The scratches most people blame on “cheap lenses” are usually caused by wiping dry grit across the surface, not by the lens itself.
What actually causes scratches on glasses?
Almost every scratch on a lens comes from friction against something harder than the coating, not from ordinary wear. Dust, sand, and the fine grit that settles on glasses over a day are the real culprits. Wipe a dry lens with a cloth, a shirt hem, or a tissue, and that grit gets dragged across the surface under pressure.
The lens itself is rarely the weak point. Most current lenses carry a scratch-resistant coating, which hardens the very top layer of the lens but doesn’t make it scratch-proof. It raises the threshold; it doesn’t remove the risk. Dry-wiping still beats that threshold constantly, which is why a coated lens can still end up dull and fogged with fine lines within a year of careless cleaning.
What should you actually clean glasses with?
Lukewarm water and a drop of mild washing-up liquid or hand soap is the combination opticians and lens manufacturers consistently recommend, and it works because it does two things a dry cloth cannot: it floats grit off the surface before anything touches it, and it cuts through the oils from skin and skincare products that build up around the nose pads and frame front.
- Run the lenses under lukewarm (not hot) water to loosen dust and debris.
- Add a small drop of gentle, fragrance-free soap to your fingertips, not directly onto the lens.
- Rub gently across both sides of the lens and around the frame and hinges.
- Rinse thoroughly, checking no soap residue is left in the bridge or hinge crevices.
- Dry with a clean, soft cotton cloth or a microfibre cloth kept specifically for glasses.
Hot water is worth avoiding on its own account, separate from scratching. Several coatings and some lens materials are sensitive to heat, and repeated exposure to very hot water can affect how a coating bonds to the lens over time.
Do you need a special cleaning spray or cloth?
Not strictly, though a dedicated microfibre cloth is worth having and worth washing regularly, because a cloth that’s collected its own grit becomes part of the problem. A microfibre cloth used dry, without rinsing the lens first, is still capable of scratching a coated surface if there’s dust trapped in it.
Pre-moistened lens wipes are a reasonable option for cleaning on the move, provided they’re alcohol-free and designed for coated lenses; some solvents can degrade an oleophobic coating over repeated use, which is the coating responsible for making fingerprints and smudges wipe off easily in the first place. Sprays sold specifically for eyewear are formulated to be gentle on both scratch-resistant and anti-reflective layers, but they’re a convenience rather than a necessity next to soap and water.
Why does a dry cloth do more damage than nothing?
A dry wipe moves whatever’s already on the lens, and that includes anything abrasive that landed there since the last clean. Grit doesn’t need to be visible to scratch — the particles responsible are often too small to see with the naked eye, which is exactly why the damage looks like a fine haze rather than a single obvious scratch. That haze is frequently hundreds of tiny scratches layered across the coating, most of them picked up during quick dry wipes on a sleeve or shirt.
This matters more, not less, on lenses with an anti-reflective coating. AR coatings sit as a very thin layer on top of the lens and show fine scratching more visibly than an uncoated surface would, because the coating’s job is to control how light reflects off the surface — scratches interrupt that evenly and catch the light.
Does the coating on the lens change how you should clean it?
Not the method, but it raises the stakes. Scratch-resistant, anti-reflective and oleophobic coatings are all thin surface treatments, and all three degrade faster under abrasive cleaning than under normal wear. The water-and-soap method is gentle enough for any of them, which is part of why it’s the standard advice rather than a specific fix for one coating type.
Where people go wrong is reaching for whatever’s nearest — a paper towel, a napkin, an antibacterial wipe meant for surfaces rather than optics. Paper products are made of wood fibre and are more abrasive than they look under a microscope. Household cleaning products and alcohol-based wipes can strip or cloud a coating outright, sometimes after a single use, and that damage isn’t repairable the way a frame adjustment is. For more on what these coatings are actually doing and where the trade-offs sit, the lenses and coatings archive covers each one in more detail.
What about cleaning the frame, not just the lenses?
The frame needs the same gentle approach, but the material changes what to watch for. Acetate handles water and mild soap well and benefits from occasional cleaning at the nose pads and temple tips, where oils accumulate and can dull the surface over time — the same shine that makes a well-finished acetate frame worth choosing is the thing that dulls first if it’s neglected. There’s more on why that material behaves this way in what makes acetate worth using for a good frame in the first place.
Metal frames raise a different concern. Many are plated rather than solid through, and abrasive cleaning — or cleaning products with any grit or strong solvent — can wear through plating faster than ordinary use would. That’s worth knowing before scrubbing at a stubborn mark on a metal temple; a soft cloth and patience are safer than pressure. The mechanics of why plating wears at specific points, usually where skin contact is constant, are covered in more depth in what plating on glasses actually is.
Screws and hinges deserve a quick check during cleaning rather than a deep clean of their own. Debris that builds up in a hinge doesn’t just look dull, it can affect how the hinge moves over time.
What should you avoid doing entirely?
- Cleaning lenses dry, even with a soft cloth, before rinsing off surface dust.
- Using tissues, paper towels, or clothing to wipe lenses.
- Hot water, which can affect coatings and some frame materials over repeated exposure.
- Household glass cleaners, which are formulated for untreated glass, not coated optical lenses.
- Storing glasses lens-down on any surface, which invites exactly the grit contact cleaning is meant to prevent.
A hard case, kept in the same place, does more to prevent scratches over a year than any cleaning product does in a single session. Most damage happens between cleans, not during them.
Does this change for sunglasses or tinted lenses?
The cleaning method stays the same regardless of tint or coating. Water and mild soap won’t affect a UV filter, since that filter is built into the lens material or applied as part of the manufacturing process, not sitting on the surface the way a tint colour does. It’s worth remembering, while cleaning, that the tint itself has no bearing on UV protection at all — a dark lens without a stated UV rating is not doing the job people assume it is, and can let more UV reach the eye than no sunglasses at all, because the tint causes the pupil to open wider. Look for UV400 or 100% UVA/UVB on any label, not the depth of the colour.
Mirror coatings and gradient tints are both surface-level treatments and follow the same rule as AR coatings: gentle, wet cleaning only, never dry wiping. The sunglasses archive covers how different tints and coatings behave in more detail, including where polarisation and mirror finishes fit in.
What’s the simplest routine to actually stick to?
Rinse under lukewarm water, add a drop of mild soap, clean gently with fingertips, rinse again, and dry with a clean cloth. Done once a day, or whenever the glasses come off after a dusty environment, this single habit prevents nearly all the scratching that people otherwise blame on the lens quality, the coating, or bad luck. The materials the frame is built from — whether that’s acetate, titanium, or a plated metal — matter for durability and finish, but none of them change what a lens actually needs to stay clear: water, mild soap, and patience over speed.
The Designer Glasses publishes general information and style opinion, not professional advice. We are writers and enthusiasts, not opticians, optometrists or dispensing opticians. Nothing here interprets a prescription, recommends a lens power, or tells you whether you need correction — only an eye examination can do that. If your vision changes suddenly, or you have eye pain, flashes, new floaters or halos around lights, treat it as urgent and contact an eye care professional the same day. Sunglasses should carry a stated UV rating: a dark lens without UV filtering is worse than none at all.