okay guys what you're looking at here is what's known as a rub brick and you buy these anywhere at Lowe's Home Depot Stein's any of the major home centers they've got these and what I've done here is going over the overspray or the XS and you see that I've done tapped my garage here still got this side to do and you see the side that I've done here and then past I've tried secretes concrete mortar dissolver this is muriatic acid that in the and the gallon jug is a product called riddle rust for removing rust because that's rust stain in here too and they all work somewhat okay but this Marshall rub brick here Marshall 10 rub brick is incredible and I'm gonna be showing you how I do it okay so what we've got here is some overspray from the concrete you can see there's quite a bit of difference here the secret is in the stone here this is a product it's called silicon carbide or also known as carborundum and it's very hard metal I mean very hard stone and it works just great you see what here's some more here [Laughter] I'm gonna have to come along and sweep and probably have a couple of spots I've got to got to redo here but you see the big difference remarkable