OK I'll take a guess.

If it's a hard-water-and-soap buildup then I don't know that there is anything that can remove it without removing your hair. Because when that stuff gets on the tub it takes phosphoric acid to remove it, and that would not be safe or healthy on your hair.

If it's wax, it may be a matter of sitting there scraping it off, then the oil and comb sounds best, get someone to help and get a flea or nit comb, something super-small-tooth, section your hair and scrape it off.

As my mom says, worst case scenario usually is you shave your head and it grows back, that's the good thing about hair.
2c / C / iii (FIA)
Med-Coarse, LowPorosity, NormalElast (LCLF)

Shoulder-Length now.

Wash: DevaCare Low Poo
Detangle & Rinseout: Walgreens or Sally's Conditioning Balm (always)
Leave-in: DevaCare OneC (budget choice is GFTN)
Style: ReCoil & DevaCare Arc Angel (budget choices are HESMU or Got2BSpikedUp)