5 leather brush mistakes that roughen car leather
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Koch-Chemie
Colorful Blue "Cb" Colour Concentrate Blue
Koch-Chemie
Colorful Green "Cg" Dye Concentrate Green
Foam colourants: Foam colourants colour the foam in suitable vehicle wash systems. The colour changes what you see and is an add-on to the wash chemistry, not proof of cleaning power in itself.
How you use it depends on the wash system and on the approval for the additive; coloured foam tells you nothing about how well it cleans.
Too much choice in Foam colourants? Get help picking: