Dawn dishsoap! I used to be a hairstylist....Dawn dishsoap works to remove haircolor without having to strip it with bleach.

I've heard dandruff shampoo fades color but I've never tried it.

Dawn works but will dry your hair out big time so when you;re all done deep condition. I don't know from experience lightening but to remove color I did color oops and then a protein color filler, first time I used neutral filler with no color to protect my hair when I re-dyed it, I used a red when I went from a dark brunette to a red head for awhile and now to help blend my few grays. My mom dyed her hair purple (my 60 year old mother) as her rebellion against her own mother who always said you can't wear people after 50. She says if you go purple as it fade it makes non gray hair look more gray

leave it alone!!!! those colors fade super quickly on their own!!!! guaranteed that after a week or so it will be lighter!!! really leave it alone!!!!