7 months ago I went from bleech blonde hair to dark and then recently went a dark red. My hair wasn't in great condition when blonde that's why I went dark. Its now in good condition. I want to go back blonde again, not a bleach blonde just a nice warm blonde but not sure how to do this? Will I need to have gradual blonde high lights? I've started using a shampoo which I'm told will help strip the colour so blonde will be easier?