ant infestation, help please


we left lucy parked for 3 months while we went to visit family for 3 months.
since we got back i have been squishing ants inside the van, i'm guessing i've killed about 200 by now.
today they had managed to find their way into our cool box, this is the last straw for my wife.
how do i get rid of them, we are full timing, and cannot bomb the van as we would have no where to sleep
any idea's please i need to keep my wife happy
 
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