I have to store my jet ski outside unfortunately so I bought a custom cover for it and I then cover that with a tarp. So I thought everything would be cool but then today I removed the tarp and my cover from the ski and there are about a million black dots from mildew. I need to know what kind of cleaner would work the best for cleaning my seat and basically everything on my ski. I know some brands contain bleach and might harm my paint or some surfaces so I want to stay away from those if I can. Somebody please help. Thanks