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Remove all the clutter in the bathroom and clean it up. The small insects in the bathroom should go in from the outside, and it is best to dispose of the debris at the door of the bathroom.
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Smoke it, some cockroach one, and then find the hole and seal the hole with candle oil, and if it's from outside, put sulfur around the window.
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It will usually be better to cover the sewer opening.
Do you have a picture? It may be a jumping worm, which is harmless to humans, and can be diluted with rotenol and sprayed.
Tide insects Pay attention to the cleaning of the toilet You can use an insecticide.
This seems to be caused by too much tide! Really have to deal with it! Is there a water leak somewhere? That dripping place!
Is it the kind of black one with small wings? There's no special way to do that, just kill them all, and then wipe the floor frequently, keep the house dry, and slowly die.
At night, before going to bed, spray some insecticide and close the door tightly. That's it.