Bachelor wash refers to a quick soap-free rinse of a plate, cup, or utensil which had recently been used. This is most useful for low-oil, water based, or dry foods. Wiping with a paper towel will usually remove residual food particles missed by the bachelor wash.

“单身汉清洗法”指的是用水快速地冲一下刚用过的盘、杯或器皿。这对于沾过油水少的汤或干货食品的碗碟最为有效。然后用纸巾擦掉没冲走的食物残渣。

Example:

I didn't want my date to think I was a pig, so I bachelor washed the dishes and tossed them in the cupboard.

我可不想让我的约会对象认为我像猪一样邋遢，所以我用“单身汉清洗法”搞定了脏盘子，把它们扔进碗柜。