Imagine a pure, clear stream of water (氵) flowing over a 'knot' or 'thread' (絜, which contains 糸 for thread and 夬 for a knot or bowstring) to wash away all impurities, leaving it perfectly CLEAN and untangled.
Vocabulary
清潔せいけつ
cleanliness, hygiene, purity
潔いいさぎよい
resigned, graceful (in defeat), manly, sportsmanlike, resolute