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I think the idea someone suggested to charge by the pound is a good one....LOL

This would make good filler for your worm bed. Added revenue stream.

You might want to try some testing and market this as a preventive measure like spraying once a year. You might be able to get one homeowner to be the guinea pig for the cost of chemicals only and see if moss grows back or it you can keep it a bay with a yearly spraying.

I am curious and I'm sure some others are also, but what do you charge for a roof like the ones you have been posting? You may be able to price your preventive measures just under the cleaning depending on how many years it is between now and when it grows back. maybe an every other year thing.

Just some suggestions as if the moss comes back you can catch it before it gets a foot hold and keep it under control.

WOW O WOW is that a pile of moss!!! Amazing, it seems that you get alot of moss there in Portland.

I have a customer that wants only a moss treatment on their roof, their is no algae, what kind of powder is used to sprinkle on roofs?

Wow! How long had that been up there?