This past summer with the extreme humidity that we have in this part of Texas the rubber trim on our trailer became a rather unsightly black especially on the south side of the trailer that is exposed to the constant wind off the Gulf of Mexico.
I have had a couple of occasions to use this product to treat mold and mildew inside and outside of a house so I thought that I would try it on the trailer. I mixed into a spray bottle a double recommended application of "Consan Triple Action 20" mixed with about 1/2 oz. of bleach. I would spray the rubber trim every other day or so for a couple of weeks and let dry without rubbing or trying to scrub off the black.
The results were not immediate and I don't know which of the products are responsible for making the black disappear. Presently the trim appears nearly new with about 98% of the black removed, only a couple of spots remain.
Here is a link to this product and looking at the MSDS it is a chemical that demands respect. Also a description of uses and items that it can be used to treat.
http://www.pesticideinfo.org/Detail_...NR=058044#Uses
This not a recommendation for this product, just giving results from a personal application.