I like the simple green also but if I have some tuff stuff to get off I use WD-40 and a xxxx fine steel wool and it scrubs most stubborn stains off then rinse it with the simple green. The WD-40 seems to remove rust well. Also not to nit-pick but in the before picture looks like the heater hose is laying on the exhaust maniflold I just wonder how long it will last there? Thanks for all the tips they helped me out as I was a Armor-all man for sometime. ---Vernski