8 Things You Should Never Keep in Your Car

Most of us have a routine when we park the car — grab the keys, lock the door, walk away. What we don't often think about is what we're leaving behind. And for drivers over 60, that oversight carries a few extra layers of risk worth knowing about. Car interiors are extreme environments. On a sunny summer day, the inside of a parked car can reach temperatures well above 130°F within an hour. That kind of heat doesn't just make the seats uncomfortable — it actively degrades medications, warps electronics, pressurizes aerosol cans, and turns an ordinary lighter into a potential fire hazard. Winter cold creates its own problems, cracking screens and affecting battery-powered devices. There's also the security side. Retirees who travel, run errands across unfamiliar areas, or park in large lots can be more exposed to opportunistic theft. A quick audit of what's sitting in your car — and what shouldn't be — takes almost no time. The peace of mind it buys is worth far more than the effort.

A lot of people keep a backup supply of medication in the glove compartment — it seems practical, especially if you're out running errands and don't want to miss a dose. But most pharmacists will tell you that's one of the worst places to store prescription drugs. The problem is temperature. Most medications are meant to be stored between 59°F and 77°F. A car parked in direct sun can blow past that range within 20 minutes. Heat breaks down the chemical compounds in many drugs, reducing their effectiveness. In some cases — particularly with certain heart medications, blood thinners, and insulin — degraded drugs don't just stop working. They can produce unexpected effects. This matters more as we get older, because many of us rely on daily medications that have narrow therapeutic windows — meaning the difference between the right dose working and not working is small. Keeping those drugs in a temperature-stable place, like a small insulated pouch in your bag or purse, is a straightforward fix that most people just haven't thought about yet.

Here's something most people don't realize: car thieves aren't always looking for the car itself. A lot of break-ins happen because someone spotted something worth grabbing through the window — and the bar is lower than you'd think. A visible pile of coins, a purse left on the seat, or even a charging cable can be enough. Smashed windows happen fast. It takes less than 10 seconds to break a car window, grab something off the seat, and disappear. And while anyone can be targeted, retirees who park in unfamiliar areas — shopping centers, medical offices, rest stops during road trips — tend to be in higher-traffic, less-monitored spots where this kind of opportunistic theft is more common. The habit to build is simple: before you walk away, take valuables with you or put them completely out of sight in the trunk. Not tucked under a seat or covered with a jacket — actually in the trunk. Thieves scan windows quickly, and anything that breaks the visual pattern of an empty car interior is an invitation.

The glove compartment feels like the natural home for important papers — registration, insurance cards, maybe a copy of your Medicare card or Social Security information for emergencies. It's a habit that goes back decades. The problem is that it's also one of the first places a thief checks after breaking in. Identity theft moves fast. With a Social Security number, a Medicare card number, and a name and address from a registration slip, someone can open accounts, file fraudulent claims, or access medical benefits — sometimes within hours of the theft. Older adults are disproportionately targeted in identity fraud cases, partly because they're more likely to carry physical documents. What actually needs to stay in the car? Your current registration and proof of insurance — that's it, and most states require those. Everything else, including your Social Security card, passport, Medicare paperwork, and extra credit cards, belongs at home in a secure spot. A small home safe or a locked filing cabinet is a far better address for those documents than your glove box.

It's easy to toss a can of sunscreen, bug spray, or WD-40 into the car and forget about it. These are everyday products, and they don't feel dangerous. But sealed aerosol cans are pressurized containers — and pressure builds as temperature rises. When a car interior climbs past 120°F, which happens regularly on summer days across the South and Southwest, aerosol cans can rupture or, in some cases, burst with enough force to shatter interior panels. The propellants inside are also flammable, meaning a ruptured can near any heat source creates a real fire risk. Fire departments and auto safety organizations have documented cases of aerosol-related car fires tied directly to heat exposure. This isn't a theoretical concern. Products like hairspray, cooking spray, spray paint, and even certain cleaning products carry warnings on the label about storage above 120°F — and cars routinely exceed that. The fix is straightforward: bring aerosol products inside when you get home, and don't use your trunk as a long-term storage spot for them during warm months.

You've probably seen the warnings about plastic water bottles leaching chemicals in heat. The concern is real — certain plastics, particularly older or low-grade bottles, can release small amounts of compounds like BPA or antimony when exposed to sustained high temperatures. Most single-use water bottles sold today use BPA-free plastic, but that doesn't mean all plastics are inert under extreme heat. There's a second risk that gets less attention: a clear, full water bottle sitting in direct sunlight can act as a lens, focusing light onto a concentrated point on your seat or carpet. The U.S. Fire Administration has confirmed that this is a genuine — if uncommon — fire risk, particularly with bottles left on light-colored surfaces. The practical answer isn't to stop keeping water in the car — staying hydrated matters, especially in summer. A stainless steel or insulated bottle eliminates both concerns. It won't leach anything, it won't focus light, and it keeps water cooler longer. That's a straightforward swap with no downside.

Prescription eyeglasses are precision instruments. The lenses are calibrated to specific tolerances, and the frames — whether plastic or a composite — are shaped to hold that alignment. Leave them on your dashboard for a few hours in July, and you may come back to lenses that have shifted in the frame or frames that no longer sit correctly on your face. Anti-reflective coatings are especially vulnerable and can craze or peel after repeated heat exposure. Hearing aids face the same problem. These are small, battery-dependent electronics with delicate internal components that manufacturers specifically warn against leaving in hot environments. The same goes for smartphones and laptops — lithium-ion batteries degrade faster when repeatedly exposed to high heat, and screens can develop dead zones or discoloration. For anyone who depends on these devices daily — and most of us over 60 do — the repair or replacement cost is real. Glasses alone can run several hundred dollars. The habit worth building is simple: take your glasses, hearing aids, and phone with you when you leave the car, the same way you take your keys.

We've all done it — unloaded most of the groceries and left a bag in the trunk, or grabbed takeout and forgotten the leftovers on the back seat. It feels like a minor inconvenience. Food safety professionals will tell you it's more than that. Bacteria like Salmonella and Staphylococcus aureus multiply rapidly in the temperature range between 40°F and 140°F — what food safety guidelines call the "danger zone." In a hot car, perishable foods like meat, dairy, and prepared meals can reach unsafe bacterial levels within two hours. On a very hot day, that window shrinks further. This matters more as we get older because the immune system's ability to fight off foodborne illness becomes less aggressive over time. What might have caused a rough 24 hours at 35 can mean a serious illness at 65 or 70. The rule most food safety organizations recommend: perishables that have been in the danger zone for more than two hours should be discarded. When in doubt, throw it out — it's not worth the risk.

A disposable lighter seems harmless enough — it's small, it's cheap, and it feels like a sensible thing to keep around. But lighters are essentially small pressurized fuel containers, and they behave accordingly in high heat. Most disposable lighters are rated to withstand temperatures up to around 120°F before the pressurized butane inside starts to become unstable. Car interiors in summer regularly exceed that threshold. A lighter left in direct sunlight on a dashboard or in a closed console can leak, combust, or rupture — and the fuel inside is highly flammable. Matches present a similar risk: the friction-sensitive heads can ignite from vibration or contact with rough surfaces in a hot, shifting environment. Fire investigators have traced vehicle fires back to lighters and matches left in parked cars, particularly in southern states during summer months. If you smoke or keep a lighter for other purposes, the better habit is to take it with you when you leave — just like your phone or your wallet. It takes one second and removes a real risk.

None of these risks require a major lifestyle overhaul. The common thread running through all of them is a single habit: taking a quick look at what you're leaving behind before you lock the car and walk away. Most experienced drivers develop a pre-departure routine without thinking about it — check the mirrors, adjust the seat, grab the keys. Adding a 30-second scan of the interior is the same kind of muscle memory, and it addresses almost everything on this list at once. Valuables in the trunk or with you. Medications in your bag. Documents at home. Aerosols and lighters not stored in the car long-term. The goal isn't to make every errand feel like a security operation. It's just to close the gap between what we assume is fine and what's actually worth a second look. A few small adjustments, repeated consistently, add up to a car that's genuinely safer — for you, your belongings, and anyone riding along.