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Polyether amine is your friend. Chevron Techron Concentrate, Gumout Regane, Amsoil PI all have lots of PEA. It's supposed to work quite nicely on carbon.
Water injection works well, too. As long as it's not much water, and is introduced where it can get to all the cylinders.
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2012 Chevrolet Cruze Eco 6MT
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