What's wrong with the bathroom vent?

1, the check valve of the ventilation duct fails, and the odor returns

2. The exhaust pipe interface of the exhaust fan connecting to the check valve is not tightly sealed

3. The management is broken, causing the odor not only to not be discharged, but to return.

4. Open the lid of a box of cool oil and place it in the lower part of the corner of the bathroom, the odor can be removed

5, often sprinkle a little superphosphate in the bathroom, the smell can be removed

6. Take 500 grams of fresh oranges, after eating the oranges, wash and dry the orange peels, and spread them around the bathroom to achieve a good effect of removing odors.