Vinegar?

Proper pipe cleaning is done using a sodium hydroxide solution. Plus, it causes permanent blindness if it comes in contact with eyes:

Other common uses of sodium hydroxide include: […]

• as drain cleaners that convert pipe-clogging fats and grease into soap, which dissolves in water

Like other corrosive acids and alkalis, a few drops of sodium hydroxide solutions can readily decompose proteins and lipids in living tissues via amide hydrolysis and ester hydrolysis, which consequently cause chemical burns and may induce permanent blindness upon contact with eyes.

en.wikipedia.org/wiki/Sodium_hydroxide

It’s genuinely dangerous, don’t handle this stuff if you don’t wear proper eye and skin protection.