How to Wash and Store Beach Towels Without the Sand Residue, the Hardening, or the Mildew Smell

A beach towel is the summer textile most people wash wrong, because the three things it carries — the sand, the salt, and the sunscreen — are the three things the residential wash handles backwards. The sand goes into the washer and abrades the drum and the towel both; the salt is the mineral that hardens the cotton if it is not rinsed before the wash; and the sunscreen is the oil that the hot water bakes into the fiber instead of lifting out. The beach towel that comes out of a residential wash hard and streaked with the gray of ground-in sand and the orange of set sunscreen is the towel that was washed the wrong order — hot first, softener, no pre-rinse — and the towel that comes out soft and clean is the one washed the right order: shake dry, rinse the sand and the salt, wash cool with a no-softener enzyme, and dry fully before the fold. The protocol takes ten minutes of attention and keeps a beach towel soft and sand-free for the season.

For bulky beach towels and the summer load you would rather have professionally laundered, our Greensboro Market St team handles summer textiles, or browse all four Royal Clean Locations.

The Three Things a Beach Towel Carries

A beach towel carries three loads the home wash has to address in order. The sand is the abrasive — a fine silica that grinds against the cotton in the wash and against the washer's drum, and the sand that goes through the cycle is the sand that shortens the drum's life and the towel's. The salt is the mineral — the ocean salt that dries into the fiber and hardens the cotton if it is not rinsed out before the wash, the same way the hard-water mineral hardens a bath towel. The sunscreen is the oil — a lipid and a UV filter that bonds to the cotton and that the hot water bakes in instead of lifting, the same chemistry that sets a cooking-oil stain. The protocol addresses all three in the order that lifts each: sand first, salt second, sunscreen third.

The Shake — Sand Out Before the Wash

The first step is the shake, and it is the one that protects the washer and the towel both. Take the towel outside and shake it vigorously — snap it, beat it against a railing, let the loose sand fly off before it ever goes near the machine. For the sand ground into the weave, a dry brush or a brisk rub of the terrycloth against itself lifts the embedded grains. The sand that goes into the washer is the sand that abrades the drum and the towel; the sand that comes out at the shake never reaches the wash. Do this every time, before the rinse and the wash, and the towel and the washer both last the season.

The Rinse — Salt Out Before the Soap

The second step is the rinse, and it is the one that prevents the hardening. The salt that dries into the fiber hardens the cotton the way the hard-water mineral does, and the soap applied to a salt-laden towel reacts with the salt to a soap scum that stiffens the fiber further. The protocol: rinse the towel under the hose or the tub with cool water before the wash, working the water through the terrycloth to dissolve and flush the salt. A towel rinsed of the salt before the soap washes soft; a towel washed with the salt in washes hard and gets harder with every beach day.

The Wash — Cool and No Softener

The wash is the step that lifts the sunscreen, and the two rules are the cool water and the no-softener. The sunscreen is an oil, and the cool water with an enzyme detergent lifts the oil without the heat that bakes it in — the same dish-detergent principle as a cooking-oil stain, where the cold lifts and the hot sets. The no-softener rule is the one that keeps the towel absorbent: a beach towel coated in softener's silicone film will not absorb the water off the skin, and the film traps the sand and the sunscreen the wash did not fully clear. A half-cup of vinegar in the rinse strips the residue and softens without the film. Wash cool, enzyme detergent, vinegar rinse, no softener — the beach towel that washes this way stays soft and absorbent.

The Dry — Full, Before the Fold

The dry is the step that prevents the mildew smell, and it is the one the damp-fold causes. A beach towel folded even slightly damp grows the mildew that smells like the inside of a wet swimsuit, and the smell does not wash out once it sets. The protocol: dry the towel fully — a medium heat in the dryer or a line in the sun — and confirm it is bone-dry before the fold. The cheek test is the one that catches it: press the towel to your cheek, and if it feels at all cool it is not dry. A fully-dried beach towel stores clean; a damp-folded one mildews in the bin. See our mold and mildew guide for the protocol if the smell has already set.

Frequently Asked Questions

How do I get sand out of a beach towel?

Shake it vigorously outside before the wash, and dry-brush the sand ground into the weave. The sand that goes into the washer abrades the drum and the towel; the sand that comes out at the shake never reaches the wash.

Why does my beach towel get stiff?

The salt and the hard-water mineral, dried into the fiber and not rinsed before the soap. Rinse the salt out with cool water before the wash, and the towel stays soft.

Will hot water get the sunscreen out?

No — it bakes the oil in. Wash cool with an enzyme detergent; the cool water lifts the oil without the heat that sets it, the same principle as a cooking-oil stain.

Can I use fabric softener on beach towels?

No — the softener's silicone film makes the towel water-repellent and traps the sand and the sunscreen. Use a half-cup of vinegar in the rinse to soften without the film.

Why does my beach towel smell even after washing?

It was folded damp, and the mildew set. Dry the towel fully — the cheek test, press it to your cheek, and if it feels cool it is not dry — before the fold.

The Bottom Line on Beach Towels

Shake the sand out, rinse the salt out, wash cool with an enzyme and no softener, vinegar in the rinse, and dry fully before the fold. Follow that and a beach towel stays soft and sand-free for the season — and for the summer load you'd rather hand off, our Drop Off Wash & Fold teams across Greensboro, Winston-Salem, and Burlington handle summer textiles.