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It may be cockroaches, ventilate and keep it dry, so that there are no gaps in the toilet, and there is no place for bugs to breed and hide!
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Put some desiccant. Lime try, don't let the kids. Or the animal touches.
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If there is floor ash at home, sprinkle some and then use insecticides.
These black-gray worms are the larvae of mothhoppers.
Regularly flush the corners of the toilet floor with boiling water and eliminate the larvae and eggs at the drain opening. >>>More
I used to have a dustpan in the bathroom, and I had to sweep it back in two or three days, and my house was also on the first floor. >>>More
Mosquito larvae. It is recommended to clean the bathroom thoroughly. Shops sell medicines to kill these insects. The price is affordable. There is also the need to keep the bathroom ventilated. Try not to get wet.
In the local dialect, it is called pot kidney, which is a kind of place that likes yin and tide, and is mostly seen in the toilet and kitchen in the family. Looks a bit like a cricket. >>>More
It's a moth midge larvae, go to the moth midge larvae, there is a way to control it!