Question

If soap and water cleans the body then what makes the towel dirty

Answer 1

While it's true that after a shower you have eliminated most of the germs and dirt from your skin, the process of rubbing a towel against the body rubs off dead skin that sticks to the moist towel. Towels become an ideal nesting place for the mildew endemic to humid bathrooms.

Answer 2

Dead skin cells and Bacteria form in wet cloth are the reason why your towel get dirty. In order to remove such dead skin cells and Bacteria, you rub your skin hardly, which is not good for you. ... If there is actual dirt on your towels then you are not using the soap, water and sponge correctly.

While it's true that after a shower you have eliminated most of the germs and dirt from your skin, the process of rubbing a towel against the body rubs off dead skin that sticks to the moist towel. Towels become an ideal nesting place for the mildew endemic to humid bathrooms.