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First Post Here. I've been enjoying gleaning knowledge from these forums. 

Being located on the west coast of Canada in the North Shore mountains of Vancouver, I deal with excessive amounts of moss. This generally means some additional mechanical moss removal is nessecary. The "love" works beautifully up until a certain point... but in many cases a little extra help is required.

Any thoughts on how to clean this Tar and gravel roof? At 40,000 sq. ft. pricing help would be appreciated as well.

My thoughts so far are:

1. Lightly rake the large clumps up and remove.

2. Treat.

3. Blow off the remaining moss after a couple of weeks.