If mildew is a problem, in your part of the world, our popular "MILDEW STAIN AWAY" may be just the answer. Formulated chlorine free so it can be used safely on any material or fabric. Created in 1983, it leaves no rings, stains or discoloring. One application keeps mildew away for up to nine (9) months. Simply spray it on, brush lightly then let set for 15 to 30 minutes and rinse with fresh water. Mildew disappears. Repeat if necessary.