The IGK Hair Mixed Feelings Cooling Blonde Mixing Drops (£25) isn't a shampoo, you're right, but it is just as effective as one. Infused with prickly pear cactus extract, the formula is designed to nourish your hair while neutralising brassiness. A little goes a long was with the concentrated pigment drops should be mixed with a leave in conditioner or hair oil and smoothed through damp, clean hair. Plus, the compact packageing makes this product perfect for travel.