I picked up a set of these garage door rodent guard strips off of amazon and used them to reinforce the vinyl weather stripping on each side of my garage doors.
Rats crawl under garage doors.
These come in various shapes and are sold are your nearest home depot in the hardware department.
They are thin metal and can be bent around the vinyl.
Look for damages on the garage door.
If your garage door has a rubber seal check it regularly.
In the infestation is already present there s nothing you can do about the previously mentioned points.
How to get rid of a mouse infestation.
A rat infestation can cause severe problems to your home s electrical and structural stability creating fire hazards.
You ll have to fight it.
No place in your home especially a crawlspace is safe from them.
Start with one and try to get as much of the towel under the door as you can.
How to get rid of rats in the garage.
Install one that is made of metal instead of vinyl.
Rats will also eat and contaminate your food.
Stop rats from getting in garage doors.
At least for your door you can start with using a door sweep stop.
Yes you can use a towel under a door to stop mice but you will need to squeeze it underneath and double up with the towels.
Mice and rats can be a tricky animal to get rid of especially in a home.
Once you have a towel under the door roll another towel up and place it in front of a closed door as you would a draft excluder.