How do you deal with Hornets/Wasp living in Car?

ARG! I absolutely hate "stingers". I don't want to talk much about it but I do have trauma... So I can't tolerate these things at all.

But something has decided to start building a hive or nest or whatever in our car. I do not know what exactly. But those combs things are there from a Wasp or Hornet on the car.

How do you suggest getting rid of the Comb thingy and what could I treat our car with to prevent junk from liking it?

We've also been having aunt problems and they've been decided to have wars on our car. We also have been having some sort of rodents getting into our car and filling it with junk. I don't know how to word this but all this junk isn't getting into our car where we ride and store stuff but these things are getting into the engine, the doors, under the car, over the tires. It's frustrating. Whatever is getting into the engine has chewed through wires before. So any other suggestions for this junk would be nice, too.

We have Allergies, Asthma, and the Air Conditioner doesn't work on the Car ( we don't know what's wrong with the Air Conditioner because we always get bad mechanics that pretend like they don't understand these "new computers" in cars so they'd need a few thousand dollars to figure out the computer). Since it's summer I figure the car is getting to 120 degrees, too. So I just want you to know so that's a factor in any suggestions. We can't spray the car with water because the water facet/spout outside is broken so that is sprays all over the place and barely any goes into the hose. It's also too far from the car anyways.. so between the distance and barely any water trickling at the end that's not helpful.