I just picked up some of the GM top engine cleaner. Alot of the guys on the benchrest forum said thats all they use. They also said that the formula has changed and to make sure the part # was 1050002. It was $6 and some change. Alot cheaper than most of the solvents we use. They also said that it has some ammonia properties to it and was good for copper fouling as well.I haven't tried it yet but I will post the results when I do.
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