This is one of those questions that keeps getting asked time and again with no clear answer until you go through it yourself. Here we go. For those who haven't. At some point you find out about 'Kleen' products. There is Kleen green and Kleen free and others. Do they work? Sure, for some people. Why not for others? Do they work for a while then stop working? Some people say so. The Kleen is part of your arsenal. Use it properly and with care and it will help greatly.