How to remove/clean this mildew or mold around the window? I have always used a 10% bleach solution to clean the entire top by spraying the solution onto the top on a sunny day. Once the mildew/mold was gone, I'd rinse it with water. However, the mildew or mold around the window only will not come clean after several attempts. Is this top/window defective in some way? Any advice would be appreciated. Thank you