Dish soap is your friend.

洗涤灵是你的朋友.

Please don't say dish soap. I hope it's not dish soap.

不要说洗碗皂。希望用的不是洗碗皂。

Let’s say I need to stock up on some household items like detergent and dish soap. This is the process I use

假设我需要囤积一些家用物品，比如洗涤剂和肥皂之类的。

Try using liquid dish soap or shampoo on a tough stain. Let it sit on the fabric for a few minutes, then launder as usual.

对于顽固的油污，可以尝试使用洗洁精或洗发水。几分钟之后像往常一样洗涤。