"DD_BobK" wrote

But surprising as it may seem... there are several acid based drain
cleaners.

I never never never recommend any acid or alkali based drain cleaners. I
always recommend using a snake. The reason is that acids can weaken rubber
washers on drain connections causing leaks. Strong acids can eat pipes.
Alkalis (such as Drano) are extremely dangerous if they "flash back" at you,
and they also tend to cake at the bottom of the trap, sometimes forming a
cement-like plug.

Snakes not only are great for clearing organic blockages, but they can also
find things that have gotten stuck such as toothbrushes, and other items.