Cleaning Exterior Cheap and very effectively.
Just wanted to share my experience. My roof had lost much of the white coating and I decided to coat it. After cleaning with TSP I had a helluva mess. Siding was covered in black streaks and spots. ...
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For our roof I use a squirt of Dawn dish soap in a few gallons of hot water. it cleans the roof very well. I got this advise off the site of a roof material mafg.
