Do not use oven cleaner on alum. Not good. Tryed that wih a power washer once.
oven cleaner on aluminum powervalves works awesome, it just doesn't work good on your hands. Ask me how I know
With a little scrubbing, oven cleaner gets every last bit of carbon off the valves. Sorry PR1, no amsoil interceptor this next winter 4 me. dominator slight possibility but most likely klotz, poo blue, or arctic blue. interceptor too thin for my liking
leaves no oil film in motor. now, back to "cleaning"
MJK, purple power is my favorite cleaner/degreaser, i put it in a spray bottle and go thru it like nuts. my mom buys the 1 gallon jugs when they go on sale for 2 for $7 at auto parts stores. She also uses it on my clothes to get grease out. Works great on just about everything. My mom used it to clean our floors, and left a puddle of it for a half hour, and we have a WHITE stain on our off-white vinyl floors.