For the most part, you’ll want to hand wash your bathing suits. Even if you can machine wash a bathing suit, you’ll want to follow any instructions to a T (like avoiding bleach and washing with like colors) to ensure that your swimsuit emerges in tip-top condition. When it comes to hand washing, do your best to wash your suit immediately after use. For instance, with Lands’ End suits, the company recommends cleaning “the same day, in cold water with a mild soap, lightly massaging it to work out the chemicals and dirt.”