1. If the moisture regain is not serious, gently wipe the wall with a towel dipped in alcohol. When the wall is dry, polish it again with fine sandpaper, then coat the wall with a moisture-proof agent, and finally brush the wall with latex paint. 2. On weekdays, if the weather is fine, open the doors and windows in time for ventilation. If the weather is bad, you should close the doors and windows. 3. If the resurgence is serious, you should contact the professional team as soon as possible, and at the same time, you should go to a regular shop when purchasing materials, and remove all the resurgence walls before repairing them.

The reasons for this situation are:

1. It may be that the waterproof layer of the external wall of the household is damaged, resulting in water seepage. It may also be that water is splashed in the bathroom on weekdays, which often leads to running water on the wall, so there is a resurgence.

2, or when the waterproof layer is not done well at home, the wall is in a wet state under the condition of long-term water seepage, and the irregular ventilation of the windows at ordinary times leads to humidity in the house.

3. Or when the householder originally decorated the house, there were problems in material procurement, such as going to ordinary stores to buy inferior products in order to save material costs.