The first step in dealing with Mildew is prevention.  Always store inflatables 100% dry.  Mildew corrodes the materials used in inflatables.  Unfortunately, so do most cleaners used to "remove" mildew.  If mildew does arise, completely dry the inflatable, and allow the mildewed area exposure to sunlight.  You may also use soap and water to clean the area, although if mildew damage is severe, scrubbing will cause the materials to disintegrate.

 

To prevent Mildew, Blast Zone recommends using Matt Kleen, especially for commercial inflatables, as it removes mildew, and a number of other pathogens, bacteria and viruses.