For some, weekend car detailing is a borderline religious experience. For others, the passenger footwell is just a glorified trash can. A new survey has finally put a name to the culprits, revealing exactly which automotive fanbases treat their cars with respect—and which ones are actively cultivating a biohazard.According to new data from AmericanMuscle, Dodge and BMW loyalists easily claim the title of America's tidiest drivers. Over 60% of owners from these two brands scrub down their rides at least bi-weekly.Credit: https://www.americanmuscle.comAdvertisementAdvertisementConversely, Subaru, Mazda, and Tesla drivers ranked dead last. The EV data is especially amusing: while the vast majority of Tesla owners swear their cabins are pristine, nearly three-quarters rarely bother to wash them, exposing a massive blind spot in what they consider "clean." Even worse, a full 10% of all surveyed drivers confessed they never wash their cars—period.The Biological Cost of a Messy CabinTreating your back seat like a dumpster isn't just an eyesore that forces 26% of drivers to deny their friends a ride out of sheer embarrassment. It is a genuine threat to your immune system.While the survey exposes our bad habits, independent laboratory research reveals the invisible consequences. According to a landmark microbiology study from Aston University, a neglected car interior is significantly more contaminated than a public restroom. Researchers found that the average driver's seat and gear selector harbor hundreds of bacteria—including strains of E. coli and Staph—making the cabin a thriving breeding ground for pathogens.Similarly, data cited by Cars.com from Queen Mary University found that the average steering wheel is crawling with 700 bacteria per square inch, which is nearly nine times the microbial load of a standard toilet seat.AdvertisementAdvertisementBut if dodging foodborne illnesses isn't enough motivation to buy a vacuum, the financial penalty of a filthy car should be.Beyond pride and hygiene, routine cleaning heavily dictates a car's depreciation curve. Dealerships and private buyers closely scrutinize a vehicle's cosmetic state to infer its mechanical reliability. Automotive detailing experts note that professional deep cleaning and paint correction can yield an incredible 150% to 300% return on investment at the time of sale. Simply keeping the cabin detailed and the clear coat protected can literally add hundreds, if not thousands, to your final trade-in offer.So, whether you are canyon-carving in a Mazda or cruising in a Dodge, it is time to grab a microfiber towel.