Have gone quite a bit blonder with a few bleach highlights for the first time in years. Please can I have your recommendations for blue or purple shampoos? My hair is quite dry and my scalp temperamental and I am reluctant to fork out the. 50 odd quid for aveda blue malva which is what they used at the salon because ime aveda irritates my scalp terribly after 2 or 3 washes. Thanks all