Meaning

noun a preparation used in cleaning something

noun the operator of dry-cleaning establishment

noun someone whose occupation is cleaning

originInherited from Middle English clener, clenner, clanner, clannere, from Old English clǣnra, clǣnre (“cleaner, purer, clearer”), from Proto-West Germanic *klainiʀō (“daintier, more delicate”), from Proto-Germanic *klainizô (“shinier, finer, more splendid”), equivalent to clean + -er.

Etymology from Wiktionary, CC BY-SA 3.0