Probably, just a plastic lawn rake for the large areas and a flat screwdriver to clean the moss out of the slots if you have three-slot shingles should do it. And, spray the shingles down after moss removal with a 50-50 mix of water-chlorine bleach to kill the moss that is rooted-entrenched into the shingles.
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... down and out, liv'n that Walmart side of the lake!
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