Take your packaged mattress topper to a well-ventilated area. Open the packaging carefully, using scissors if necessary.
Remove and unfold your mattress topper. Lay it on a flat surface. Leave the topper 48 to 72 hours to allow for full expansion, as recommended by the manufacturer.
Place the topper on top of your mattress. Make your bed as usual.
Dampen a cloth with water and apply one pea-sized dollop of clear liquid soap.
Clean the soiled spots and sections of your mattress topper by applying slight pressure, using small circular motions.
Rinse the cloth and reapply clear liquid soap when necessary.
Continue until all soil has lifted. Air dry completely before covering with linens.