AbilityOne 6850009652332 Carbon Removing Compound - 5 Gallon CanAbilityOne 6850009652332 Used in soak tanks to soften and remove carbon, gum, and other surface contaminants (except rust and corrosion) from items such as automobile pistons, carburetors, and engine assemblies pre cleaned with degreasing solvent. pH = 11. 5. Used in soak tanks to soften and remove carbon, gum, and other surface contaminants (except rust and corrosion) from items such as automobile pistons, carburetors, and engine assemblies pre