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First thing, clean out your truck. Make sure there are no candy wrappers, etc. Then put out some ant killer. That gel-like stuff works great. Should take care of the rest of the ants and you won't have to park the truck.
Borax dusted into the carpet should help a lot. Once the ants are gone you can just vacuum it back up. It's not so safe that you can go eating it but there's a lot worse stuff you could be using.
they got stingy im gonna try the baby powder thing put it where they were trying to build a nest and i dont have carpet ive got the plastic like stuff its an xl
Go to a garden supply store and get some diatomaceous earth (DE). It is a non-toxic powder and you can sprinkle it around the truck. The tiny crystals will cut up the ants exoskeleton and dry out their insides.
You can also mix up some orange oil and water and it will kill the ones that are still crawling after the DE. You can get the orange oil at some of the garden centers also.
Due to chemical sensitivities, I can't use the stuff you pick up at the home centers.
The natural products I've mentioned have really worked well for me.
Diotomaceous earth should also be readily avaliable at any swimming pool supply place. Many pool filters use this as a filtering agent as opposed to sand in some models.
Borax dusted into the carpet should help a lot. Once the ants are gone you can just vacuum it back up. It's not so safe that you can go eating it but there's a lot worse stuff you could be using.
x2 on this! Ants, and a lot of other bugs including roaches, rats and mice hate borax. You can find a big box for cheap in the laundry aisle. I use borax around the house and outdoors. I keeps the ants away.