Prepare a plastic bag, put the mushroom puff inside the bag, then pour an appropriate amount of water into the bag, and add some puff cleaner inside, using half the amount of water and half the amount of cleaner. Afterwards, seal the mouth of the bag and use your fingers to knead the puff from outside the bag. Do not use too much force when kneading, as the residue in the puff should be removed. Then open the bag and wash the puff under water. The water washed out is free of impurities and foam, which means it is very clean. At this time, squeeze the water out of the puff, which can be squeezed several times. After the water is almost squeezed, put the puff in a cool and windy place. Be careful not to expose it to the sun, or it will be deformed. When the puff is dry, store it well.