To properly wash the cover that comes with our mattress topper, follow these instructions. Wash in cold water using a non-chlorine bleach detergent on a gentle cycle. Dry on a low heat tumble cycle. Iron on low heat setting. Do not dry clean. The foam portion of the mattress topper is not washable, but should you need to clean a small area on the foam portion of the mattress topper, it is recommended that you spot clean. Use an absorbent towel to remove as much liquid as possible. With warm water and a few drops of dish detergent, work from the outside of the stain inward, dabbing it while applying as little soapy water as possible