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First make sure that you don't have access to the outside world, and then clean up the kitchen with sticky fly paper or fly swatters, and then pay attention to it.
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It should be a sewer problem.
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Carefully inspect the corners of the kitchen to see if there are any dead critters, possibly from their corpses.
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Find the source of the sanitation problem, clean it up, get rid of the flies that come in, put fly paper on their area, and remember that flies don't bite eggs without droppings.
A species of cockroach, the German cockroach, can be killed with insecticides.
It's good to buy rat sticky or fly incense on the street.
Cockroaches can be removed by doing the following for a long time: >>>More
1. The methods to get rid of flies are as follows:
1) Keep the kitchen neat and clean. >>>More
The same is true of the house I rented recently, the last tenant bought a boxed lunch, and there was oil everywhere. Buy some cleaning products to clean once, and then clean slowly later, and gradually it will be clean, and it is impossible to clean it all at once.