If someone tht sponsors this board has chemicals that will do the job and will educate the poster, delete it.
From time to time, experienced contractors will come here and ask questions tht can't be answered with "get insurance" or "do your research". This board seems to draw all of the newbies. If it had some advanced solutions, it may draw some more attention from guys that have ben around longer and actually buy equipment and chemicals.
I make no apologies for posting that link.