If you do a search for "amodimethicone," you'll find a lot of threads about it.

Lowpoo will remove it. Natural soap/shampoo bars (saponified oils) will not.
3a (Corkicelli), highlighted, fine, low porosity

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic (now Hello Curly Curl Stimulater); Botanical Spirits Jellies, CJ Repair Me, Aloe Fix