“to wash” in Japanese is 洗, read sen, ara (せん, あら). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 洗面 (washing the face).
What does 洗 mean?
手をきれいに洗う。
Same sound, different character — the classic trap. Compare them side by side: