I have made liquid shampoos and bar shampoos, I honestly like the bars much more than the liquid.
#1 Liquid soaps are VERY temperamental, they have a tendency to have a high PH and can either dull your hair, or cause it to dry out excessively!
#2 Liquid soaps (from scratch) take a VERY LONG time to make, unless you have some 12 hours set aside just for 8 - 8oz. bottles of liquid soaps, well it isn't very cost effective, then to not know if it's going to dry, or if it's going to turn out completely..... I have made the exact same batch of soap 10 times over and NEVER had it go the same way twice!
Then talk about volcano's well, I learned the hard way the making liquid soaps over a gas stove with all the alcohol and such well, it will go boom! yeah i've done it, it isn't fun! :shock:
either way, I do like the use of a bar shampoo, i have had MUCH more luck with it, however you still have the problem with the natural oils in the hair being 'built up' on the hair itself, and that is an easy fix with a little apple cider vinegar rinse, which by the way works incredibly!
I am not against liquid soaps, but to me I have MUCH more things I can do in a 12-18 time frame than melt one batch that will produce only 8- 8oz bottles........ That is just my opinion.