Rinse your Pianella's bikini in cold fresh water immediately after swimming to remove chlorine, salt, and sunscreen.
Hand wash gently with mild detergent, avoid wringing, and lay flat in the shade to dry. Don't tumble dry.
Carvico fabric, that this piece is made from, is a high-performance elastane blend. Machine washing can gradually weaken the elasticity and fade color faster, especially with heat, spin, and regular detergent. If you must machine wash, use cold water, delicate cycle, no fabric softener, and air dry.
Avoid rough surfaces and excessive heat (hot tubs, radiators, direct sun for long periods) to preserve stretch and color.