A mattress requires wet cleaning and considerable drying time before you can use it again. Although we get as much water as possible out of it, it may take up to 12 or even 24 hours to dry out entirely depending on the kind of mattress, the remaining moisture and the indoor humidity. For faster drying, we recommend placing a mattress vertically in a drafty area. Otherwise, you should turn it upside down once the upside is dry.