Lye is much more effective with a little heat.
In unrelated random thoughts, NurdRage and Nile Red are some of my favorite YT'bers
Muriatic is like a pseudonym for hydrochloric. If you see liquid drain cleaner bottled in a second plastic bag on the shelf of a local hardware store, that is probably sulfuric acid and is much stronger than most other stuff. That's useful for lots of things like a few steps away from dissolving gold or epoxy. The combo or bulk may raise some eyebrows. I like to dissolve epoxy chip packaging to view the silicon die and etch the metal layers off... for example.