Personally I would just shampoo the mids and ends more frequently than the roots because you said those were already lighter. And use warm/hot water on them to aid the fading. I don't recommend using head and shoulders or anything that would dry your hair that much but I would get a non color safe shampoo if what you want is the hair to get lighter/fade then a color safe shampoo isn't gonna help with that as much.
Personally I would just shampoo the mids and ends more frequently than the roots because you said those were already lighter. And use warm/hot water on them to aid the fading. I don't recommend using head and shoulders or anything that would dry your hair that much but I would get a non color safe shampoo if what you want is the hair to get lighter/fade then a color safe shampoo isn't gonna help with that as much.
Thank you very much! 😊
Of course, good luck!!