After doing some research on the subject, I found that active ingredients in pretty much any Fuel Injector Cleaner Additive will remove intake valve carbon deposits in direct injection engines. I used to use CRC Intake Valve Cleaner for decarbonizing carbon decarbon decarbonizing decarbonization.

These detergents are called PolyEtherAmines or PEA and are found in concentrations of up to 50% in several commercial grade fuel injector cleaner additives

This is the exact same method people use when using seafoam.

You just have to pour it directly into the intake of the engine for it to go directly to the carbon in the intake runners and valves and react to it.

#IntakeValveCleaner #CarbonBuildUp #DirectInjection