Im looking to add tile and grout to my carpet cleaning. I have a 175 17" with solution tank. I'll be getting a med grit showerfed brush for it. Can someone explain the process using this machine. Also we are a green cleaning company can someone reccomend a natural product to use? I have heard of biowash before, is that a good choice? My only experience cleaning tile is by hand with brushes and very harsh chemicals. Thanks in advance.