I have a ton of carbon and oil buildup. I have to get this caked on tar off. Citrus degreaser was way too weak. WD40 is too mild and superclean didn't help much either. Enyone know of a really good degreser?
Also, the power valve is stuck due to carbon build up. Mr Wrench looks like it might do the trick, but again, anyone know of a more powerful penetrating oil?