There are always all kinds of creatures crawling out of the bathroom on the first floor of my house,

You can sprinkle some sulfur or something like that on the door to scare away bugs, or spray some insecticide so that there are fewer bugs.

Buy some insecticides, or some instruments to catch insects and rats, and it's better to do more hygiene, so that there will be a lot fewer insects.

You can ventilate the bathroom and keep it dry, so that there are few small bugs crawling in. If there are more mosquitoes, you can put some mosquito medicine.

Every night before going to bed, pour some pyrethroid suspension into the floor drain to kill the eggs of the gnats. Wash basins and vegetable sinks should also be sprayed, but not directly, but at the bottom of the water closest to the ground.

You can ask professionals to go to the site to see what kind of insects they are, and then analyze the causes, and then carry out targeted treatment.

Spray insecticide at the mouth of the toilet drain before going to bed, the universal kind, which is available in pharmacies and on the Internet, and pay attention to avoid pets and children approaching.

Buy some insecticides and put them in the bathroom, and the most important thing is to keep the bathroom clean, preferably with some desiccant in it.

You can buy some insecticides and put them in the bathroom, but be careful not to let children touch them to avoid poisoning.

Some pesticides can be purchased and sprayed at that location for a long time. If you feel that the smell of the insecticide is not good, you can also ask a professional insect repellent to help.