 Yeah, so much to tell. What about that copper color on concrete? I see this around Virginia Beach or some of the nicer cities where I think it's from the water being sprayed, maybe from people's well water. It's from the iron in the water, and it causes a rust looking. We use a product. It's basically an oxalic acid that you apply to it, let it sit on there, and it removes it. It has nothing to do with pressure or anything. It's a chemical reaction.