Do You Really Need to Deep Clean Your Car? Here’s What Happens If You Don’t

Your car is your mobile living room, snack bar, storage closet, and sometimes even your nap zone. But if it’s also become a collection site for empty cups, old receipts, and mysterious smells, you’re not alone. Many of us overlook deep cleaning our vehicles and while it might seem harmless, there could be some sneaky consequences for your health.

So, how gross is it really to never deep clean your car? We asked experts to weigh in and their answers may inspire you to grab the wipes and vacuum this weekend.

What Happens When You Skip Deep Cleaning

While not cleaning your car won’t immediately land you in the ER, over time it can affect both hygiene and air quality inside your vehicle.

1. Germs Can Build Up Fast

“Your car is a transitional hub between the real world and your home,” says Kelly Reynolds, PhD, a professor at the University of Arizona Zuckerman College of Public Health. That means every surface from your steering wheel to the seatbelt buckle can harbor bacteria and viruses you’ve picked up from the outside world.

Studies show staph bacteria, acne-causing microbes, and even mold spores are common on high-touch car surfaces. While the risk of serious illness is low, touching those areas and then touching your face (which drivers do an average of 26 times per hour) can increase the chances of infection.

2. Old Food Can Turn Into a Breeding Ground

Dropped crumbs, fast food wrappers, or spilled drinks might not seem like a big deal, but they’re a buffet for bacteria and mold. “Food particles attract germs,” says Reynolds, who explains that even a small splash of milk in your coffee spill can cause microbial growth. Left unchecked, these germs may cause unpleasant odors and potentially aggravate allergies or asthma.

3. Dust Isn’t Just Cosmetic

Dust inside your car can carry chemicals like flame retardants and allergens, according to research in the International Journal of Environmental Research and Public Health. A 2015 study even found that dust mites were present in over 15% of car seats, with levels high enough to trigger indoor allergy symptoms. This is especially concerning for people with asthma or respiratory sensitivities.

How Often Should You Deep Clean?

While a monthly cleaning is generally sufficient for most people, Reynolds says that how often you clean should depend on how you use your vehicle. “If you eat in your car, have pets, or drive kids around regularly, you may want to clean more often,” she says.

The good news? You don’t have to be perfect. “You won’t eliminate every germ, but basic upkeep helps reduce your risk of illness,” Reynolds says.

Easy Ways to Keep Your Car Cleaner

You don’t need a professional detailing appointment to make a difference. Here’s a doable routine:

• Remove trash and food wrappers daily. Toss them when you get home or stop for gas.

• Wipe high-touch surfaces weekly. Use sanitizing wipes on the steering wheel, gear shift, dashboard, and door handles.

• Vacuum seats and floor mats monthly. A portable wet/dry vacuum can help with crumbs, dirt, and pet hair.

• Use upholstery cleaner as needed. Target visible dirt, oil, or stains.

• Disinfect cup holders and touch screens. A gentle spray that’s safe for your car’s interior works best avoid bleach.

• Clean car seats thoroughly. For parents, this is key. Remove and wash fabric covers, and disinfect the plastic base.

What About Car Smells?

Funky odors are often the result of trapped moisture, spilled drinks, or microbial buildup. Cleaning the upholstery, using an air purifier designed for vehicles, or placing a moisture-absorbing packet under your seat can help neutralize unwanted scents.

So, How Bad Is It Really?

It’s not the end of the world if you don’t deep clean your car every month. But skipping it entirely can contribute to germ buildup, bad odors, and even reduced air quality over time.

“You don't need to obsess,” Reynolds says, “but regular upkeep is an important part of maintaining a healthy environment.” Wiping down surfaces and keeping clutter at bay can go a long way in keeping your mobile space a safe and pleasant place to be.

For more practical wellness tips, subscribe to our newsletter.