I have a customer who has a fiber cement building with rust stains from water running out of a rooftop planter down the siding. I can scrub it off with a magic eraser, but the area is huge and 25+ ft. tall. My extension brushes don't have enough friction. I was hoping someone might give me some insight on using F9. I have just started using it this year, and have only done concrete so far. Can it be used on painted surfaces? Has anyone used it on fiber cement?
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Chad A. Eneix, President, Water Dragon Inc. chad@waterdragoncleaning.com
It can be used on painted surfaces, I'm not sure about fiber cement but my guess is yes no issues I would either do a small test spot and/or reach out to Craig from F9 he's always more then willing to assist.
Post some before and after pictures would love to see how it works out.