OxiClean is the right move for white swimwear.

Yes, but pre-treat with dish soap first. Sunscreen stains are oil-based, so Dawn or any degreasing dish soap breaks that down before you go after the yellow.

Soak the swimsuit in cold water. Rub a drop of dish soap directly into the stain and let it sit for 15 minutes. Rinse. Then soak in a bucket of water with a scoop of OxiClean (or generic oxygen bleach) for a few hours. Hot water helps the oxygen bleach work, but check your swimsuit tag—most are fine with warm, not scalding. Rinse. Repeat if needed.

Avoid chlorine bleach—it destroys spandex, turns whites yellow, and smells like regret. Oxygen bleach is gentle and lifts the stain without wrecking the fabric.

Don’t use bleach—it ruins stretchy fabrics faster than sunscreen ever could.