Sunscreen stains can be removed in the washing machine. But first, you've got to pretreat with a tough stain remover. To do this, you can use commercial or homemade stain removers. Some of the local stain removers are based on vinegar, chlorine bleach, and dishwashing soap, among others. After pretreating, you can wash normally with a heavy-duty detergent, rinse and dry.