I have a head I picked up that Im not going to take apart. it has dirt atached to the oil residue that has dried and its kinda dirty all inside the head from sitting In a garage for a while. Any one got any sugestions on a chemical that will break that shit up and what to do after I hit it with a chemical like hi pressure spray teh head? I want to try and remove as much soot as possible in teh nooks and crannys of the head. I really didn't want to make a thread to ask this question but couldent find any info online, besides de-assemble adn hot tank, and thats not happening.