I have mildew growing on the gutters and vinyl siding on the side of the house that doesn’t get much sun. I noticed on your website that you suggested the use of Jomax, bleach and water. Is this recommended for gutters?
Mildew or mold will always grow on exterior surfaces that don’t see much sun – at least in our Wisconsin climate. I would definitely wash with a Jomax solution, bleach and water. Follow the label instructions. Often you can just spray the solution on the stains with a garden sprayer and then rinse them off. This is an inexpensive cleaning solution that “activates” the laundry bleach.
I’m not sure how the Jomax chemical works, but I know that it works great on vinyl, aluminum siding, and aluminum gutters. It also works on any hard surface with mold or mildew. I found that it does not harm plant materials, but I would wet them down before and rinse them after you use Jomax.