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Borax detergent can be used to control ants. Use a 50/50 solution of Borax mixed with sugar placed in a small cap. Place the cap near the ants.
Besides Borax, try sprinkling a baby powder firewall near the ants' point of entry to make ants inside they lose their scent trail, get lost, and eventually die.
To discourage ants, draw chalk lines around doorways and windowsills; ants don't like particles sticking to their feet.
For the last one, try drawing a chalk line around your car for a few days. If that doesn't work, then you may be using Eric's suggestion...lol
I love those recommendations from Eric and Highhorse, but I haven't tried any of them.
The best remedy for ants that I have found is Combat Max Ant Killing Gel. It comes in a syringe, and you apply dabs of the gel along the paths the ants are using to travel to and from your car. The ants eat it, carry it back to their colony, and a couple of days later they're all gone. Our local Home Depots used to carry it but now they only carry the roach version for some reason. But if you can find it, it has definitely worked for us.