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Depending on the carbon buidup, i could see that as a possibility for helping to prevent Carbon buildup(much like the meth could, but that's been a long debate with no real conclusions either way.)
However, it's not going to remove any carbon that's built up. Once it builds up some of it will begin to harden. The only way to do it is either media(walnut) blasting or a combination of chemical and pressure washing with HOT water.
Also, the source of the carbon has a lot more to do with EGR than PCV.
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"I'm not surprised you get along well with all the other neighbours. If you put fifty children with Down's syndrome in a room there is going to be a lot of hugging." David Thorne
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