A shop specializing in a particular brand might use non-chemical means to get carbon off the valves - media blasting using walnut shells followed by vacuum seems to be popular with the very best VW/Audi and BMW shops. But the dealerships and most shops will use a BG/MOC product, and there's stuff 3M/Penray and the chemical suppliers sell to the aftermarket.
I don't think that orifice in that tube cares what brand or chemical is going through it. The Berryman's product is based on hot solvents, while Gumout's Multi-Use Treatment is similar to SeaFoam but with a dose of PEA in it. It will be slower but PEA does have a little residual effect.
I don't think that orifice in that tube cares what brand or chemical is going through it. The Berryman's product is based on hot solvents, while Gumout's Multi-Use Treatment is similar to SeaFoam but with a dose of PEA in it. It will be slower but PEA does have a little residual effect.