It is sensible to conduct a periodic inspection of the mattress cover to ensure that there are no rips or tears or punctures in the fabric. The first phase is to wipe down the cover with a damp cloth using a mild detergent. The mattress cover can then be unzipped. Each mattress cover has a powder white lining. Signs of fluid ingress are normally visible due to staining. If you find that the mattress cover is damaged it must be disposed of safely and replace with anew.