Wash a waterproof mattress protector: read the care label first
A waterproof protector can have a sensitive membrane. Follow its specific temperature, bleach, tumble-dry and ironing instructions.
Waterproof mattress protectors may contain a polyurethane barrier, unlike ordinary sheets. One IKEA LENAST protector permits a gentle 60°C wash and low tumble drying but prohibits bleach and ironing. Other protectors have different temperature limits, so never assume 60°C is universally safe.