I washed my sweater in hot water and it shrunk.
I married him because he said he likes doing laundry, but he still hasn't even done it once.
"Is my white shirt in the wash?" "Oh, that one had lipstick on it, so I took it to the cleaners."
Wash wash to wash your clothes. You wash wash your laundry. Hmm wash wash sounds like the sound my laundry machine makes when it's washing my underpants.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.