Before Using We suggest leaving the mattress topper to expand for fluffy about 72 hours before first use, since it is packaged vacuum for convenient shipping. Shake and pat the baffle boxes to help them refluff. Tumble dry on low heat for 15 minutes could easily make it refluff. This also works for daily care. Daily Use No bleach or dry clean. We do not recommend washing in agitating washing machine because it may destroy the structure inside. A bed sheet will do an excellent job of preventing it from becoming dirty. Spot wash is recommended when needed.