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Do you want to start with the CG method? Then use a final-wash† This shampoo from XHC is perfect for this. The shampoo contains sulfates that ensure that all product residues from your 'old' products disappear from your hair. This shampoo is therefore the first step you take within the CG Method.
Please note: you only use this shampoo once! Keep the shampoo! Who knows, handy for the future (for example if you accidentally use a non-cg product or when you dye your hair)!
You use a final wash once because it is 'non-cg' because it contains sulfates.
Basically you use it once. Do you use a non-cg product or do you occasionally dye your hair? Then it is useful to use the final wash again.