what the best way to clean out the inside of a tpi plenum & runners????
I've tried degreeser & a rag
Don't laugh but i also tried:
letting it soak in the bathtub w/ dish washing soap like "Dawn"
lol, i even put it in the dishwasher (hope my 'ol lady don't come home any time soon...heheheh)
and it's still black & gritty on the inside
any of ya have any better ideas??