Dan,
I'm new to the board again after a couple years.
I also wish i could bleach their roof. I also wish i could bleach it.
however, if i don't find anything else i will have to use sodium hydroxide. that really sucks considering the pitch on their roof.
the owner said if i were not happy using a gallon then he would refund my money, but i guess i would have 2 wait 2 yrs to get that refund.
I do know this. I sprayed oxyclean on their roof to c how it would do. It hasn't hurt any plants but i don't think it has the staying power to stay up there. I think it would take 2 much time to make a difference well enough to get paid in advance. I do have a contract in work from my atty. to ensure the customer.
do you or anyone else know about phats and how effective they are. I have done a lot of research the last few days and have found out ( or think i have ) that this product is a phat. I don't mean any harm with any of my posts or comments. (or bleach) but this home is about 7,000 sq ft. i guess if nothing else works then i will clean it the old fashion way with s. h.
btw, the oxyclean cleaned well, but i think it would require several coats to do so. this customer will not have a problem with my experiments.
I c that I am not an expert but i think phats might be the answer.
I'm gonna try physan-20 next. I will let u know and the rests of us that are interested.
thx.
doug