My compressor tank is covered in old grease and dirt and oil. A whole can of engine degreaser barely made a dent, and I just burnt out my grinder with a wire wheel. 60 grit sandpaper is no match for this stuff. What should I use to get rid of the grease? I am going to sand the paint on there before I prime and repaint it. Also, how should I clean the rust and stuff on the underside of where the compressor mounts? Evapo-rust?