Question: car is infested with roaches?
Answer: Clean, Clean, Clean. Roaches made their way into your car because they sniffed out food. ... 
Stop Eating in Your Car. ... 
Sprinkle Diatomaceous Earth or Boric Acid. ... 
Roach Fumigation – With Caution. ... 
Traps and Bait. ... 
Keep Roaches From Coming Back.