You might want to throw your swimsuit in the washing machine with everything else when you get back from your trip, but hand washing is the best way to take care of swimwear. Pay attention to the fabric, too. If you've gone silky, buy a delicate detergent. If your swimsuit is more sporty, you might need a detergent that's suitable for Lycra and stretchy fabrics. Whatever you do, don't leave your swimsuit to soak overnight; this damages the fibres. Leave it to soak in cool water for 30 minutes and then rinse. If you simply must machine wash, get a mesh bag for your suit. One more thing: never, ever wring excess water out of your suit, as it'll ruin the shape. Press out excess water with a towel instead.
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