Reference answer 1: The method is simple. Just peel off some Chinese yam and boil it in water for about 10 minutes. The clear water in the pot will gradually turn brown. Spraying boiled water on the sewer can quickly eliminate the odor. The odor of sewage is mainly produced by waste residue fermentation. After the yam skin is boiled, the benzoquinone component contained in it will dissolve in water and directly contact with the odor produced after fermentation, so that it will disappear.

Reference answer 2: First, check whether the sewer is unobstructed and whether there are foreign objects affecting the drainage. If there is a blockage, you can pour an appropriate amount of alkali into the sewer, which is more effective in removing grease and rust in the pipeline. Secondly, if the sewer is not blocked, but it smells, you can use the principle of water seal to put clean water in a thin plastic bag, seal the bag mouth tightly, and put it on the sewer mouth to seal the smell. In addition, it is best to keep clear water in the bowl-shaped water storage structure at the sewer mouth at the same time, which can effectively prevent odor from coming out.