FWIW, The 50/50 solution is direct from Kieth Monks. Haven't screwed up a piece of vinyl yet using this solution. I admit that I don't buy garage sale items so rarely have to do this type of cleaning. Never-the-less, don't knock it unless you try it. I swear, if people believe what they read from the manufacturers regarding vinyl cleaning solutions, you'd be buying their tap water for $100 a half pint.