Eliminating moth flies (and larvea) of unknown origin found mostly in kitchen
Really if it is like that you can do two things:

As Dandavis suggested - water+murphy's oil takes care of it fast.   It works, I have used it multiple times.

You need to do a thorough cleaning.   This is emptying under the sink, moving oven out and cleaning under, same with fridge, trash can (I had an insert in my last trash can and in between the insert and the bottom was food and it was a nightmare - so perfectly clean kitchen and one clump of food hidden), take out all bottom drawers and make sure nothing is under them, all cabinets, pantry, and on top of cabinets.


There is always a chance that you could have a dead animal in the wall but it usually isn't the case.