I have platinum blonde hair ( well did ) and i put on an ashy toner, but it’s gone DARK GREY!! I want my platinum blonde back and I’ve tried shampooing 6 times and used baking soda but it’s still grey. how can I get it back, can I apply a white toner over this toner. I have an extensions fitting next week for the colour of my normal hair. I used the ashy toner to get some brassy tones out never expected this