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Generally, small insects are bred in the sewer, you can sprinkle some 84 disinfectant in the sewer, use the original solution without mixing it out, or soak 84 with gauze to block the crossing, it will be better after a long time!
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What should I do if I find ants in the bathroom?
Moths, also known as gnats, are common flying insects in toilets. (The larvae in the picture) - usually from the sewers. It can be destroyed with pesticides and hot water. Finally, flush the sewer pipe with hot water, so that the larvae, pupae and other dead ...... inside
It should be caused by poor drainage, water smell gushing up, or toilet cleaning or unclean flushing.
Ways to remove a lot of black spots on a tile floor.
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Check everywhere if there are damp or moldy places, open windows for ventilation, and clean them!
You can sprinkle the bathroom with more water and let the downstairs look at it to see if there are any new traces of water seepage, maybe that trace is the previous one. If there is still water seepage, then your bathroom needs to be waterproofed again.