Caustic cleaner Crossword Clue

 The answer to the crossword clue "caustic cleaner" is LYE.

This is a 4-letter word that refers to a strong alkaline substance that can cause burns on the skin and eyes. Lye is often used in cleaning products, but it can also be used in other applications, such as making soap and paper.

The word "lye" comes from the Old English word "leac", which means "lye" or "lye water". It is thought that the word came to mean "caustic cleaner" because lye was often used to clean clothes and other household items.

Here are some other possible answers for the crossword clue "caustic cleaner":

AMMONIA

BLEACH

HYDROCHLORIC ACID

SULFURIC ACID

NITRIC ACID

SODIUM HYDROXIDE

I hope this helps!