Simple Green is a great way to clean your engine, I dilute it with water (1 part water to 2 parts Simple Green) on recommendation from my bro-in-law; I forget why he recommended it, but he is a mechanic so I did it anyway. I used to clean my Duster with Simple Green, and I had to "polish" some bits with a brass brush, the kind you clean off the barbecue grill with, if I came across any really tough crud. If you use one of those, be careful to avoid any hoses. ;) Best of luck, sorry for the late reply. By the way, those of you following my car affairs, the Duster was totalled. I got $2700 for it, which I used as a down payment for a 1998 Ford Ranger. Perhaps when I get the DeLorean I can tow it home with the truck. Har har. All the best. Farrar Hudkins 89.9 WWNO New Orleans, LA