Is it better for my hair to be clean or dirty when I apply John Frieda Precision Foam Colour 9N Sheer Blonde® Light Natural Blonde?

As mentioned in the user guide, it is best to apply the product to hair that does not have a strong build-up of styling product. If you have styling products on your hair, please wash your hair one day prior to colouring with this beige-blonde hair colour.

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