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My Gran had her roof powerwashed. The guys worked from a roof ladder and laid a 3x4 tarp out to catch all the gunk from the roof. She had it sealed afterwards.
Looks like a top job. Need to be careful with a pressure washer if it's an old roof though.
I'm glad i'm not the only one to get asked if i can do this......mines a bungalow with a shallow pitch. They way I'm gonna tackle mine is a very strong mix of bleach in my 5 ltr pump up bottle then spray it all, leave it for a week or so hopefully it will all die and go crispy and dry then using a stiff bass brush go and sweep it off.