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Neither of our Chem-Dip products is a great solution for a one-time cleaning. Your best bet for dissolving carbon from EGR and PCV valves is to use Berryman B-12 Chemtool Carburetor, Choke & Throttle Body Cleaner aerosol (part #0117 & part #0120). If you want a soak-type product, you can use Berryman B-12 Chemtool Fuel Injector Cleaner (part #0116). If soaking, avoid exposure to excessive heat, sparks, and flames, and make sure you soak in something chemical resistant (glass or metal, for example) with a lid to prevent evaporation.