No I don't use a full strength shampoo because I don't use cones and the diluted shampoo does the job very well (probably would work if you did use cones too though). I use a squirt bottle and just put about a half teaspoon of shampoo (color-protect Paul Mitchell with sulfates is what I have been using) and then fill the rest up with warm water and squirt all over my scalp letting it run over my length. I'd say the squirt bottle is about 8 oz. I got it at Sally's in the "color" section.
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