After using the WetVac and placing it back on the charging base, the vacuum can start self-cleaning and self-drying; additionally, the charging base is equipped with a drying plate that can be safely heated to assist in the drying process. The drying temperature of the full-air duct drying system is capable of reaching 40-degree Celsius to ensure that the rolling brush is stored in a dry state and will not produce a musty smell. 

If the rolling brush has a musty smell, please try the following troubleshooting steps:

1. Place the WetVac on the charging base and repeat the self-cleaning process several times.
2. Make sure to wait until the self-drying process is completed. It will take approximately 3 minutes.
3. Remove the rolling brush and air dry the brush to make sure it is completely dry.

If you have any additional questions, please contact us.