Mr_T_2024 You don't have to keep the mod in if you 'd rather play without mods. All you need to do is place the mod in your mod folder, start the game, go to any lot in that zone, turn on testingcheats, use one of the cheats I posted earlier. If you want the zone to be reset to its original state like it was before you cleaned up the litter, etc. the first time, use the first cheat. That is all you need to use for a full reset (except the mural by the cave, that doesn't reset). Once you've entered the cheat, wait a little bit with the game running and you will see the litter, etc. reappear and the trees etc. change color. If you don't see any change within a few minutes, exit to the map, then reload the lot. Once you see that the zone has reset, save and exit. Remove the mod then restart the game. The mod is not needed for normal game play unless you want access to all the debug cheats all the time. After you've restarted, the next time you load one of the lots in that zone, you should get the 1st popup shortly after loading in.
Hope this helps.