There are a lot of people here who just can't use lye based soaps, liquid or otherwise on their hair.
There's a reason why that is so.
SHORT STORY: When I first joined in 2017 even the mention of making lye-based shampoo bars and liquid shampoo was FORBIDDEN. As a consequence, I was pilloried unmercifully for offering input. My posts were abruptly deleted, as were Newbies' posts like this one. SMF members were in danger of being
banned if they admitted to using lye-based shampoo. There are quite a few here who do but they are not all that forth-coming although a few courageously "fess-up" when the subject comes up.
It took a long time for SMF to get to where we are today. Both syndets and lye-based shampoo are allowed to be discussed -- just like on any other forum/group I've been on since 2004. It's a good thing! Many soapers outside of SMF offer lye-based shampoo bars online and at markets and events. They are popular. The 3 wholesale customers I had over 10 years+ sold shampoo bars. All were good sellers.
While I agree that some people can't use them, I think it's sad when a Newbie who wants to know how to make them is side-lined into making syndets without first trying a natural shampoo or bar. After reading horror stories about how soap
is drying and breaking hair that no amount of time or vinegar can fix, I would go that direction too if I didn't know better.
Speaking just for me, I didn't learn how to make soap to go back to using synthetics/detergents on my skin and hair. For one thing, why would I do that when I can buy the same thing, i.e., that kind of shampoo, right off the shelf, for less money? Just the investment in cost for ingredients and time makes no sense to me.
It took a long time for SMF to get to where we are today. Both syndets and lye-based shampoo are allowed to be discussed -- just like on any other forum/group I've been on since 2004.
It's a SOAP Making Forum, afterall!