Hey guys, my upper plenum is off for an injector upgrade and a few other odds and ends. I really want to clean the plenum up, inside and out. What is the best method/solvent/product that you guys have used to get the years of crap (grease, grime) off the exterior of the plenum? I have pretty hefty oil deposits inside the plenum. What is best to spray inside to clean out? Any help would be appreciated.
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