noun, noun or participle which takes 'suru'
soaking before washing; pre-soaking
Refers to leaving dirty laundry, dishes, etc. to soak in water (often with detergent) before the main wash. Commonly used as a noun or with する.
汚れがひどい食器は、つけ置きしてから洗うと落ちやすい。
For heavily soiled dishes, it's easier to clean them if you soak them first.
洗濯物
Lukewarm water is effective for pre-soaking laundry.