HESMU made it feel like there was a yucky plastic film on my hair. I was low-pooing regularly at the time I tried it, but it took more than one or two low-pooings to remove the buildup. (That was years ago, before people awakened to the fact that it could be better for our hair just to do a single, clarifying sulfate cleanse, and get on with it.) I wasn't sure which ingredient or combination of ingredients caused that, but I chucked it.
Peace,
Morgan

Baby Fine 3B, low porosity, normal density and elasticity
CGing since July 2008