Memory foam mattress toppers conform to the human shape because of their cell structure. A 5 to 7.5 cm (2 to 3 inch) topper on a firm mattress reduces pressure points and can prevent morning aches and pains. Memory foam holds water like a giant sponge, so washing it can be tricky. Memory foam should never be put in the washing machine and only some types can be dry cleaned.
Pre-treat stains, either with a product recommended by your topper's manufacturer, or with a mild household linen cleaner. Use a damp sponge to blot the stain. Remove as much of the stain as possible with a gentle circular motion. Let it dry thoroughly.
Vacuum the topper. Use a hand-held vacuum over the entire surface on both sides.
Put a single bed-sized mattress topper in the bath if you have a detachable hand-held shower head. Larger pieces should be cleaned outside on a plastic sheet or other clean surface where they can be reached by a hose.
Fill a spray bottle with one part mild washing powder to two parts warm water. Spray the topper thoroughly, covering all surfaces. Let the detergent work for about half an hour.
Rinse the surface without saturating the material. Gently squeeze out extra moisture but don't twist the foam.
Let the foam dry for several days. Keep it away from direct sunlight and lay it flat so it doesn't lose its shape. A hair dryer can be used on smaller pieces of foam.
Check the washing instructions. You may be able to have it dry cleaned. Buy a mattress cover to protect the foam.
Do not put memory foam in the washing machine or tumble dryer. This can cause it to shred.