Every mama should wash they're play pen this way. :) Not just the normal "wipe down". Fill up your tub with the hottest water possible. Add 1 1/2 cups of laundry detergent 1/2 vinegar 1/4 cup baking soda Mix in water. Let set for thirty minutes then flip and leave for another 30 min. Hose down with the shower hose or outside garden hose. Let air dry outside or in the empty tub over night. Repeat if you have a really dirty play pen. Or suggested every 1-2 months wash again. Happy washing!