More Help

So, here are a few suggestions to  help 
"Send 'em packing":

1. Remove all packrat nests or middens in the area.

2. Clean out all debris in the engine compartment.

3. Power wash the engine compartment and apply "Purple Power" or  Biokleen to fully erase the lingering scent that the packrat has left.  Be careful to avoid sensitive electronics in the area. 

4. Park the car in an area away from walls, buildings, and other hiding places with at least 10 feet of clear area around the car.

5. Remove all food sources from the car, such as pet food, bird seed, and hay and old fast food wrappers. Note that
packrats like haypiles, especially when stored on wooden skids. It gives them a secure place to hide.

6. Don't park the car near piles of boxes, garden tools, or any place where the packrats can find cover from predators. Avoid parking near leaf piles and have them removed immediately.

7. Trim nearby shrubbery or cactus up off the ground. This eliminates their hiding places.

8. Use a live trap such as Hav-a-hart to "thin the herd." Placement of the traps is important here. Place the traps along walls or garage doors where you see evidence of pack rat activity, usually marked by their "pellets".

Yes, they are rather amusing to watch,
but their food droppings also attract pack rats!
This also applies to those nice little packets
of seeds that we leave out for the birds.

10. In some severe cases it may be necessary to add other means of protection.
Sonic devices are an option when all else fails.  Coyote urine is also said to be an effective deterrent. Some people have been known to place flashing Christmas lights under the car. Even though some of these things may be considered ineffective, they are certainly worth trying!

Dryer sheets. They don't work, the odor does not repel them.
Moth balls. 
They're toxic to both humans and animals.

Poison bait. 
It's a bait! It attracts them and in turn kills their predators and is a danger to your pets. It may also take several days for the poison to work giving them time to re-invade your car.
By following all the above steps you can get your packrat problems under control!

On occasion we have observed severe problems with very aggressive or determined rats. They may have marked their territory, are hormonally driven, and have a strong drive to preserve their adopted home.  In these cases a broader approach is necessary to persuade them to nest elsewhere.
P.O. Box 4389
Cave Creek, AZ 85327

Unfortunately, getting rid of pack rat problems is not a one step process, but it is often a continuing process of control and elimination.  Some female pack rats have been known to deliver up to five litters per year with each litter having as many as five young. The offspring may open their eyes between 10 and 12 days after being born and are usually weaned between 14 and 42 days. After around 60 days, most become sexually mature
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Poison kills pets
Don't let packrats party in your car!
This just in!

Birth control for roof rats could slow the spread of destructive pests

 A product called ContraPest is made by an Arizona company SenesTech. It is a liquid substance that renders both male and female rats infertile for anywhere from two to six months.

This sounds like a good long term solution, I will try to get more information soon.

The link to the Arizona Republic article is here: