I've recently gone from darkish hilighted hair to a lovely ashy shade which I love. However I'm finding maintenance a bit difficult. Hairdresser advised that due to hair being stripped and bleached, it needs to not be washed too often. So I'm washing it about every 5/6 days with Provoke Touch of Silver shampoo, left on for a few minutes in the shower, and followed by the Touch of Silver conditioner. However I'm not sure if they are right for me, I went back to hairdresser yesterday for a toner as it was gone yellow in spots (just 3 weeks since I got it done). How can I maintain it this lovely icy grey shade? Every time I used the Provoke it seemed to make the colour lighter - I want it to stay the shade it is now. Colourist said to keep using the purple shampoo but is there a better one? And should I use some sort of home toner stuff as well? Thanks