The short answer: Clean sunglasses by rinsing them under lukewarm water, adding a drop of dish soap, and rubbing gently with your fingertips before drying with a microfibre cloth. This is safe for polarized, mirrored, and gradient lenses. Skip alcohol, ammonia, glass cleaner, and dry wiping, which strip coatings. An ultrasonic cleaner is the gentlest deep clean.
Why sunglasses need careful cleaning
Sunglasses carry coatings that ordinary clear lenses do not. Polarized filters, mirror finishes, gradient tints, and UV layers all sit on or near the lens surface. Wipe them dry with the wrong cloth or hit them with the wrong chemical and you can scratch the surface or strip the finish, leaving streaks, rainbow patches, or peeling that never comes back.
Sunglasses also collect more grime than people expect: sunscreen, salt from sweat and seawater, sand, and skin oil all build up fast in summer.
The safe step-by-step method
- Rinse both lenses under lukewarm running water first. This washes away sand and grit that would otherwise scratch as you rub.
- Put a single drop of plain dish soap on each lens. Avoid soaps with lotion, citrus, or bleach.
- Rub gently with your fingertips, covering the frame, nose pads, and hinges too.
- Rinse thoroughly until the water runs clear.
- Dry with a clean microfibre cloth, dabbing rather than scrubbing.
Polarized and mirrored lenses
The method above is safe for both, but the coatings are more delicate, so the rules matter more. The mirror finish on the outside scratches easily, so never wipe it dry or use a paper towel. Polarized film can be damaged by heat and strong solvents, so keep sunglasses out of hot cars and away from alcohol-based cleaners. Gentle soap and water is all these lenses need.
What to avoid
- Alcohol, acetone, and ammonia. These dissolve coatings and the bonding behind mirror finishes.
- Household glass cleaner. Most contains ammonia, which is made for windows, not lens coatings.
- Dry wiping. Rubbing dust across a dry lens drags grit over the surface and scratches it.
- Tissues, paper towels, and shirt hems. The fibres are coarser than they feel and leave fine marks.
- Hot water. High heat can warp frames and lift coatings.
How often to clean sunglasses
Give them a quick rinse-and-dry whenever they look smudged, and a proper wash after a day at the beach or pool, when salt, sand, and sunscreen are at their worst. A deeper clean once a week clears the hinges and nose pads. Store sunglasses in a hard case rather than tossing them in a bag, where loose keys and grit do most scratching damage.
Why ultrasonic cleaning is the gentlest deep clean
An ultrasonic cleaner uses sound waves to form microscopic bubbles in water. As they collapse they lift dirt off the lens and out of the hinges and nose-pad gaps where sweat and sunscreen collect. Nothing touches or rubs the surface, so there is no scratching risk to mirror or polarized finishes. The Lensio cleaner handles this in a few minutes with plain water and a drop of soap, reaching spots a cloth cannot.
Frequently asked questions
Can I clean polarized sunglasses with ultrasonic? Yes. Ultrasonic cleaning is contact-free, so it is gentle on polarized film and mirror coatings. Use lukewarm water with a drop of mild soap.
How do I remove scratches from sunglasses? You cannot. Scratches are permanent damage to the lens or coating. Cleaning removes film and haze, but a scratched lens needs replacing. Prevention is the only fix.
Can I use eyeglass wipes on sunglasses? Use only wipes labelled safe for coated lenses, and never alcohol-heavy ones. If unsure, soap and water is the safest choice.