Consider soap molecules to be a magnet which attracts both oil and water. Whereas water and oil don’t. So you need something which attracts both or just oil to clean something.
Dry cleaning works by washing clothes in an organic compound like petrol or acetone. Which dissolves oil.
Try this at home : Put some oil and water in a glass and try to mix them. Now add just a pinch of detergent and mix them. You’ll understand what i mean.
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