Anyone know what this black is on my foam washing material and how to clean it off? My thoughts is that is a type of mold as it starts as black dots and continues to grow. Getting it on both Belanger Neotex and Gallop brush material. I have tried dawn dishwashing liquid, Acidic soap, hi ph soap, bleach water, and house washing chemical with algae remover. We use mostly acidic lube soap after the car is coated with a hi ph presoak in our wash process.