Mysterious white powder

[gjetzen]

While I am not planing to use the Montana for a few months, I thought it would be a good idea to give it a thorough cleaning inside and out. I went up on the roof and cleaned/scrubbed and checked all of the caulking and washed and waxed the fiberglass. I used a household cleaner diluted 1 cup to 2 gallons of water and a soft nylon brush to clean everything. Now I have noticed that every time it rains I get this mysterious white powder at each corner right under the down spouts. I went back up onto the roof to inspect it and see nothing unusual going on. The cleaner I was using is called Tuff-Stuff and was recommended and purchased at the local Keystone dealer, it is what they say they always use and is good for black streak removal. The instructions say that it is excellent to use on natural and synthetic rubber, fiberglass, plastics, stainless, aluminium, vinyl flooring, glass and painted surfaces for removing "tough dirt" and to use full strength. This powder that is left behind has the consistency of ashes. Anyone out there seen anything like this?

[old turbo]

It is to late in your area to put a sealer on the roof at this time. The temperature may be to cold to apply it. I would not get to concerned about the white powder as it is just residue from the cleaning process. You may have loosened up particles on the roof due to an ageing process and the elements. When it gets a little warmer in your area like April or May clean the roof again just to get it white then apply a sealer.

[gjetzen]

Yeah, there is about 6" of snow on it right now.

[stiles watson]

THAT'S IT!!!! Snow is called "white powder".

[gjetzen]

UMMMM I wonder? Nah! Good one there Stiles almost had me.