Well, I've used the Sea Foam Liquid on 3 pistons so far and it's doing a decent removal of the hard carbon. I soak the piston for a few minutes making sure it's been thoroughly covered with the liquid Sea Foam then I cook it in an old propane grill until it stops smoking.Then I power wire brush the entire piston. Safety is important. I do this away from the house/garage and keep an extinguisher handy. So far though there have been no flame flairs,just a lot of smoke which the precautions on the Sea Foam container clearly explain.
