By cutting one side of the sponge smoothly, we were able to create a sponge that can be washed properly down to the smallest gaps. Even in places where you are concerned about whether you can wash them properly, such as Tupperware and the lid of a lunch box, the lick cut reaches to the corners, and you can wash it comfortably. If the angle of the snail cut is too thin, the force will not be transmitted, and if it is too thick, the sponge will not reach the groove. It's just the right shape that I found after repeating the test. For the green and yellow parts, we used a special high-density sponge. Compared to general non-woven fabrics, special dense processed sponges that are more resistant to friction are less likely to deteriorate because there is almost no fluff, pilling, or peeling decomposition, and their detergency can be maintained for a long time. The specially enhanced sponge is resistant to losing its shape, so it can be used for a long time and remains clean. If you wash your clothes every day and the sponge is not tired, you will feel better. The dense sponge is resistant to losing its shape, so it can be used for a long time and remains clean. If you wash your clothes every day and the sponge is not tired, you will feel better.