Accidents are a part of life, which is why we strongly recommend covering your child's mattress with a waterproof sheet. However, if you've purchased a fold-out bed and a spill has already occurred, you might still be able to salvage it. We recommend applying a suitable enzymatic cleaner to the affected area and leaving it to work before going over the mattress with a handheld steam cleaner. To keep mildew from setting in, leave the bed in the sun and allow it to dry completely. If stains or odors persist, try repeating the steps outlined above before giving up and replacing your portable toddler bed.