Whether you use your swimsuit daily or just once in a while when vacationing, the fabric can take a beating from pool chemicals, salt water, sand, high temperatures, and sunscreen lotions. Since bathing suits can be expensive—especially for women—it's well worth your time to learn how to keep them looking great all season. Learning how to wash a swimsuit is the first step. Always use cold water when washing a swimsuit—hot water can fade colors and damage elasticity. It's best to rinse it after each washing, hand-wash it after a few wears, and if you must put a bathing suit in the washing machine, then place it in a mesh bag for protection.