Take care of the fleas on your cats and you won't have a flea problem in your car
You are taking the fleas into your car on your shoes or pants cuffs. Get your cats treated for fleas (vet meds, please) and then spray the grass, bushes, plants, around where your car sits. You will have to spray about every 3 weeks as the eggs hatch...eventually you will win the fight.
Where i park my car, is where most of my cats hang out, and ive already found some fleas in my car so is there anything i can do to prevent more?