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When I was a kid a local snowmobile racer would glass bead blast his pistons. Said it cleaned em up real nice but didnt effect the material.????? High school auto shop teacher would soak them in chem dip carb cleaner. (The shop had a 30 gallon drum) That was 20 years ago. I think the formula now is different and hard on metal?



It's different but it's not that it's hard on metal...It's ineffective or carbon... EPA approved...