washed with water, but when washing, it doesn't mean that we should directly throw the whole calligraphy-writing cloth into the water for washing or into the washing machine.
When cleaning, we can dip some soapy water or detergent first, and then dip the water into the writing side by dipping it in water.
When washing, we must pay attention to that only the writing side can be dipped in water, and the other side can't be dipped in water, and we must wipe it gently with our hands instead of rubbing it hard when washing.
after washing, when we want to wash soapy water, we can put a basin of water in it first, and then wipe the water with a writing cloth bit by bit.