"We have mice again" is one of the most common things people say after paying for treatment. It rarely means the product failed. It usually means one part of the job was never done.
Bait, traps, and monitoring reduce the mice that are already inside. They do nothing about the gaps those mice used to get in. If the entry points stay open, the house is simply restocked from outside — by the next family of mice in the wall, the yard, or the unit next door. A population can be knocked down completely and still come back within weeks.
A technician places bait stations, comes back to check them, droppings slow down for a while, and then the scratching starts again. Homeowners often catch a handful of mice on their own snap traps between visits and wonder what they're paying for. That cycle is the signature of a program that only treats the population and never closes the building.
Exclusion means finding and sealing the openings mice actually use: gaps where pipes and wires enter the building, the space under exterior doors, foundation cracks, vents, and the areas around utility lines and gas meters. It is slower, more physical work than setting stations, and it's the part most often skipped. Materials matter — mice chew through foam and soft sealants readily, so openings are closed with metal mesh, hardware cloth, or other rodent-resistant materials.
This happens, and it usually means one of three things: an opening was missed (often low on the foundation, behind a deck, or around a utility entry), a repair was made with a material mice chewed through, or the mice were already inside when the house was closed up. After exclusion there should still be trapping to remove the mice sealed inside, and a follow-up to confirm activity has actually stopped.
In the older rowhouses and multi-family buildings common around Jersey City, walls and utility chases are shared. You can seal your own unit well and still have mice moving through the structure from next door. In those cases the realistic goal is to close the paths into your living space and coordinate with the building where possible.
If the answers are only about bait stations, you're paying for the half of the job that doesn't last.
Store food and pet food in hard containers, clear clutter along walls in basements and closets, and don't block or move stations that were placed for you. Keep track of where you find droppings and when — that record is genuinely useful for finding the entry points.
Mice back after treatment? Call (833) 767-2812 and we'll look at how they're getting in, not just how many there are.