(Latin: wash, washing; bathe, bathing; by extension, clean, cleaning)

(Latin: wash, clean; washing of water against the shore; a flood)

(Latin: clean, cleanse, purify)

(Latin: putatus past participle of putare: to think over, consider, reckon, count; to trim, prune, lop, cut, clean, clear, unmixed)

(Latin: sound; pure, clean, whole, genuine, untainted)

(Greek: upper air, purer air [alcohol and sufuric acid]; in scientific terminology, "volatile, clean-smelling, euphoria-producing liquid composed of alcohol and sufuric acid")

(using plants; such as, algae to clean up waste water)