Cleaner

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Old English clǣne, of West Germanic origin; related to Dutch and German klein ‘small’.

wiktionary

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clean +‎  -er(“ agent noun”)

clean +  -er

etymonline

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cleaner (n.)

"one who or that which cleans," mid-15c., agent noun from clean (v.). Meaning "shop that cleans clothes" is from 1873. To take (someone) to the cleaners "get all of (someone's) money" is from 1921.