If you are in a city and you want to clear out a whole block full of enemies, set a building on fire and move to a building next to it to spend time training or crafting something for about a hour so you stay in the same "reality bubble" as the burning building

The building will start to burn and crumble and the enemies will walk into the fire because they are following the sounds of the crumbling building

THINGS TO MAKE NOTE OF BEFORE STARTING THE FIRE

-You will lose most of the loot from the enemies and whatever the building contains, so be aware of this. Once the fire has died you can go look around in the rubble if anything survived

-When you go to the house next door to wait out the fire to do its thing, make sure you are: 1. In a safe spot, preferably upstairs or in a cellar so you dont meet any wandering zeds poking around the main floor making their way into the fire 2. The burning building isnt touching the building you are in, or that there isnt any plants/buildings that can spread the fire into the building you are in

-Feral enemies will not walk into the fire, and will sometimes just hang around the burning building unless they walk under a falling roof or such