Vetrolin White N Bright is the best I've found so far. Have heard good things about Orvus though.
Purple shampoo, the stuff that people use for helping to achieve silver hair
Dobson and horrel blue colour shampoo!i love it with my two greys❤️😂
I have herd wonders about smart grooming products
Just mix purple shampoo and rubbing alcohol. Works better than any one you can buy. I believe the ratio is 1 part shampoo and 3 parts alcohol
I have a coloured and the best thing I have found is washing up liquid! It’s super cheap and works wonders!