ANSWER:

If it is making a layer and a barrier over the skin that prevents water from reaching, you must remove it. If it can’t be removed, you must, after making wudhu or ghusl, perform tayammum for the areas missed.

QUESTION: I wore chemical henna which causes a barrier during my menses and when I became pure I tried but couldn’t remove all of the barrier. So I performed ghusl and prayed as it was late already.