It is a dishwasher made by knitting linen into a cylindrical shape.
Put your finger in the tube and use it.
It's not as thick as a sponge, so you can use it on your fingertips to reach the edges of pots, the back of lids, and even the corners of dishes.
It is woven from durable linen, so it is comfortable to wash, and simple stains can be removed without using detergent.
It is hygienic because it is easy to remove bubbles and water, and it dries quickly.