Hand Laundering Is Ideal
Bathing suits are bestwashed by hand, rather than in the washing machine.
If you must put swimwear in the dryer, use a no heat cycle.
Drying a bathing suit flat, rather than hanging it to drip-dry, will prevent it from stretching out.
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Prevent and Treat Yellowing in Light-Colored Suits
Exposure to sun, chlorine, sunblock, etc.
can cause problems in white or light-colored suits, too.
Rinse well and air dry.
Those stains need to be treated in the same way as you would a rust stain.