A friend took upon himself to paint my front steps to my home, without my prior knowledge. He used exterior latex paint. I had planned and have the paint, for exterior masonary(Drylock). But now I have to clean the latex off, to do it correctly. Naturally, now the latex is peeling off. How can I clean this off properly, to prepare for the Drylock !!!Please make the procedure as simple as possible, because I am somewhat limited with severe arthritis! Thanking you in advance..... a longtime fan....Janet S. Claassen