1. The first step is to pour mild detergent into the water basin and stir evenly with a plastic spoon so that a layer of foam floats on the water. The detergent used cannot be aromatic or aromatic. It cannot contain any dye, otherwise it will damage the hat.

2. The second step is to soak the sun hat in the pool. Use a toothbrush or other brush to clean the hat. Concentrate on the areas with the most dirt, but brush lightly where there are trademarks or signs.

3. The third step is to rinse the hat under cold water. Drain the water from the sink, then turn on the faucet, make sure the water is cold, then put the hat under it and rinse it out, scrubbing it with your fingers occasionally until all the dish soap is gone.

4. The fourth step is to dry the hat. Stuff a few clean dishcloths inside the hat to help shape it, otherwise the hat will easily deform and become unwearable.