Sunglasses Care: Sand, Salt Water, Sunscreen and Summer Heat
Sunglasses spend their working life in the harshest conditions. A simple routine keeps them clear through sand, salt, chlorine, sunscreen and heat.
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Sunglasses do their job in exactly the places that are hardest on eyewear: sandy beaches, salty spray, chlorinated pools, hot cars and sunscreen-covered hands. They are also the pair most often tossed onto a towel or hung on a shirt. With a little care, they can stay clear for years.
The four summer threats
Sand. Sand is abrasive. Wiping sandy lenses with a cloth or a shirt grinds it across the surface and scratches coatings.
Salt water. Salt dries into crystals on lenses and frames. It can leave residue, scratch when wiped, and contribute to corrosion on metal hinges and screws.
Sunscreen and chlorine. Sunscreen leaves an oily film that is hard to wipe away. Some sunscreen ingredients and insect repellents may affect certain frame materials and coatings. Pool chemicals can leave residue.
Heat. Car interiors, dashboards and direct sun on a towel can expose sunglasses to heat that can warp frames and damage coatings and laminated lenses.
The beach routine
- Keep a case in your beach bag. A hard or semi-rigid case keeps sand out; see our sunglasses case guide.
- Never set sunglasses on sand or a towel. Sand gets into hinges and onto lenses.
- Apply sunscreen before putting sunglasses on, and wipe your hands before handling them.
- Rinse before wiping. If lenses get sandy or salty, rinse them with fresh water. A bottle of drinking water works if there is no shower.
- Dry with a clean microfiber cloth.
- Store in the case in the shade.
After the beach or pool
When you get home:
- Rinse sunglasses under lukewarm running water.
- Wash gently with a drop of lotion-free dish soap to remove sunscreen and salt.
- Pay attention to hinges, nose pads and the area where lenses meet the frame.
- Rinse thoroughly.
- Dry with a clean microfiber cloth, and let the frame air dry fully.
- Brush out the case and rinse the zipper if it was exposed to sand or salt.
On the water
Boating, paddling and fishing add the risk of losing sunglasses overboard.
- Use a floating retainer strap to keep sunglasses attached and help them float if they fall in.
- Choose polarized lenses for glare reduction on water.
- Rinse with fresh water after each outing, especially metal frames.
Heat protection
- Keep sunglasses in a case in a shaded part of the car, not on the dashboard. Take them with you on hot days. See glasses in the car.
- Do not leave sunglasses in direct sun on a towel or table.
- Avoid wearing sunglasses in saunas or hot tubs.
Polarized and mirrored lenses
Polarized lenses reduce glare, and mirrored lenses reflect light. Both need gentle cleaning:
- Rinse first to remove grit.
- Use only clean microfiber.
- Avoid ammonia-based cleaners and solvents.
- Store in a well-lined case.
Our lens coatings guide explains why these lenses scratch and how to avoid it.
Frames and hinges
Salt and sweat can corrode metal parts and loosen screws. After summer use:
- Check hinge screws and tighten gently if needed. See fixing loose hinges.
- Look for discoloration on metal frames.
- Check nose pads and temple tips for stiffness or discoloration and replace them if needed.
Common sunglasses mistakes
| Mistake | Result |
|---|---|
| Wiping sandy lenses dry | Scratches |
| Hanging sunglasses on a shirt neckline | Drops, stretched hinges |
| Pushing sunglasses onto your head | Stretched temples, hair product on lenses |
| Leaving sunglasses on the dashboard | Heat damage |
| Cleaning with a beach towel | Grit, lint, scratches |
| Storing loose in a beach bag | Scratches from sand, keys and bottles |
End-of-season storage
Before putting sunglasses away for winter:
- Clean them thoroughly as above.
- Check screws and parts.
- Dry completely.
- Store in a clean hard case in a cool, dry place.
Summer care checklist
- Case in the beach bag.
- Sunscreen on before sunglasses.
- Rinse before wiping.
- Clean microfiber cloth packed.
- Fresh water rinse after salt water or pool.
- Never on the dashboard, towel or sand.
- Hinge check at the end of summer.
Caring for different frame materials in summer
Sunglasses frames are made from a wide range of materials, and each one reacts a little differently to sun, salt and sweat.
- Acetate and other plastics are the most sensitive to heat. They can soften and drift out of shape if left in a hot car or on a sunny windowsill. If your frames start to feel loose or crooked after a hot spell, an optician can usually reshape them with controlled heat.
- Metal frames such as stainless steel and titanium handle heat well, but salt and sweat can collect around hinges and screws. Rinse them after beach days and dry the hinge area thoroughly.
- Nylon and flexible sport materials are resilient, but rubber nose pads and temple grips can become sticky or discolored with sunscreen exposure. Many sport frames have replaceable pads and grips.
- Wood and bamboo frames should be kept away from prolonged water exposure and dried promptly. A light wipe with a damp cloth is usually enough.
Packing sunglasses for a beach trip
A small kit keeps sunglasses in good shape for a whole vacation:
| Item | Why |
|---|---|
| Hard or semi-rigid case | Keeps sand out and survives a crowded bag |
| Two microfiber cloths | One for cleaning, one spare if the first gets sandy |
| Small bottle of fresh water | Rinse sand and salt before wiping |
| Retainer or floating strap | Prevents losses on boats and in the surf |
| Small zip bag | Keeps the cloths clean between uses |
Store the kit in the shade under a towel or umbrella rather than on top of the bag in direct sun.
Signs your sunglasses need attention
Look for these signs at the end of a season: lenses that stay hazy after washing, a frame that sits crooked, hinges that feel gritty or loose, nose pads that have yellowed or hardened, and a case that no longer closes firmly. Most of these are inexpensive to fix if you catch them early.
Storing sunglasses through winter
Many people put summer sunglasses away for months. Before storage, clean them thoroughly, dry the hinges and nose pads, and place them in a clean hard case with a fresh cloth. Store the case indoors in a cool, dry place rather than in the car or garage, where temperatures swing. In spring, check the screws and give the lenses a quick wash before the first sunny day.
Frequently asked questions
How do I get sunscreen off sunglasses?
Rinse with lukewarm water, wash gently with a drop of lotion-free dish soap, rinse again and dry with a clean microfiber cloth.
Can salt water damage sunglasses?
Salt residue can scratch lenses when wiped and can contribute to corrosion on metal parts. Rinse with fresh water after exposure.
Is it safe to clean sunglasses with drinking water?
Yes. Rinsing with plain bottled water is a good way to remove sand and salt before wiping.
Should I buy a floating strap for boating?
If you spend time on boats or paddleboards, a floating strap is an inexpensive way to avoid losing sunglasses overboard.
Bottom line
Rinse before wiping, keep sunglasses in a case instead of on towels and dashboards, and wash off salt and sunscreen at the end of the day. These small habits keep sunglasses clear through every summer.