The Summer season is winding down. There’s still some swimming weather ahead, but when you are ready to pack up your bathing suits till next year, you can wash out chlorine and sunblock stains with dish liquid (I like Dawn). It will gently remove any grease, sweat, and chemicals from the fabric. This will preserve your suit. Just rub some on before washing in the cold/delicate cycle as usual. Air-dry and it’s ready to pack.