You can’t kill them in mass quantities. Take everything out of your car, put it in sealed plastic boxes, or even those bags that seal up with your vacuum. Any clothes in your car, immediately wash, and then seal them. Throw away any paper products, even books, and magazines. They aren’t attracted to a particular type of food, but it’s best you get rid of crumbs. Get under any cushion, and spray them with a particular form of Raid Ant and Roach spray. Make sure the spray isn’t pet friendly, or natural. You can’t kill them naturally. Also their stains don’t come out of fabric, and they’re attracted to the smell of their own dead bugs. Also, a single bug can ruin your car all over again, and infest in 4 months, especially in the summer. I wish I was wrong about all this, but soap and water is meaningless to these things. Hopefully they’ve decided to just leave your car. That often does happen