I've got a couple heads laying around my shop I want to use this spring but they've got a bunch of dirty/oil/grease/grime/carbon buildup on them. Since I've got time to work with, what's the best way you guys have come across to get that buildup off of them? I've heard soak in water over night, I've heard soak in carb cleaner over night, among other things. Anything that's worked better than another for you guys?
