How to get rid of bad smells in your car

To get rid of a bad smell in your car, find the source and remove it. Air fresheners only cover a smell for a few days. Most car smells come down to one of five things: old food and spills, damp carpet, the air conditioning, pets or smoke. Each one has its own fix.

Why does your car smell?

Something is breaking down somewhere in the cabin, or something is wet. Fabric, carpet and foam soak up spills and moisture, and a closed car in the Sydney sun works like an oven. That’s why it’s strongest when you first open the door on a hot day.

Work out what kind of smell it is before you clean anything:

• Sour or rotten: food, milk or a spilled drink, often under a seat.
• Musty or earthy: damp carpet or underlay.
• Dusty and stale when the fan comes on: the air conditioning.
• Wet dog: hair and oils in the carpet and seats.
• Stale smoke: it’s in every soft surface.

How do you get rid of food and spill smells?

Find the spill and clean that exact spot properly. Pull out the mats, slide the seats right forward and right back, and check under them with a torch. Vacuum everything, then clean the area with a fabric or carpet cleaner, blot it with a towel and let it dry fully with the doors open.

Milk is the worst one. It soaks through the carpet into the underlay and goes rancid, and cleaning the surface doesn’t reach it. It needs an enzyme cleaner, and often more than one go.

What causes a musty smell?

Water getting in and staying in. A musty smell means the carpet or the underlay beneath it is damp. The usual causes are wet shoes and umbrellas, a window left open in the rain, blocked sunroof or door drains, or a leaking seal.

Press your hand hard into the carpet in each footwell and in the boot. If it’s damp, dry it out with the doors open on a warm day and work out how the water got there. Leaves and flowers blocking the drains is a common one on the North Shore, and I’ve covered what trees do to cars in how to remove tree sap and bird droppings. If the damp keeps coming back, that’s a leak, and a mechanic or windscreen fitter needs to look at it.

Why does the air con smell when you turn it on?

Dust and moisture in the system. The cabin air filter traps dust, leaves and pollen, and once it’s clogged and damp it smells stale every time the fan runs. Most cars have one behind the glovebox, and it’s a quick swap you or your mechanic can do at the next service.

It also helps to turn the air con off and leave the fan running for the last minute or two of a drive. That dries the system out.

Can you get dog smell out of a car?

Yes, mostly, but the hair has to come out first. Dog smell lives in the hair and in the oils it leaves in carpet and fabric. Hair weaves itself into carpet, so it takes a rubber brush or a pet hair tool to lift it before the vacuum can do anything. Then the fabric gets cleaned.

A job I get a lot: a wagon in Wahroonga with a labrador who swims every weekend and rides home in the boot. The owners can’t smell it any more, but their passengers can. Once the hair is out and the boot carpet and seat backs are cleaned and dried, most of the smell goes with it. A washable boot liner stops it building up again.

What about cigarette smoke?

Smoke is the hardest smell to remove, and I’ll be honest about that. It gets into the headlining, the seats, the carpet, the seatbelts and the air vents. A full interior detail takes out a lot of it and a new cabin filter helps, but in a car that’s been smoked in for years some of it may hang around. I’ll tell you what I think is realistic once I’ve seen the car.

Do air fresheners and home remedies work?

Air fresheners don’t fix anything. They add a second smell on top. Bicarb soda sprinkled on dry carpet and vacuumed up the next day can help with mild odours, and so can airing the car out with the windows down. None of it works if the source is still in the car.

When is it time for an interior detail?

When you’ve cleaned what you can reach and the smell is still there, or when you’re selling the car. Buyers notice smell before anything else. What an interior detail includes covers the process and pre-sale detailing covers getting a car ready to sell. For keeping on top of it, see how often you should detail your car.

Interior details are done mobile across the North Shore, including Wahroonga, Turramurra, Pymble and Gordon. Every suburb is listed in mobile detailing vs drop-off.

Smell you can’t track down?

Tell me the car, where you are and what it smells like. Request a quote and I’ll text you back to confirm the right service and a time. There’s no payment to enquire. Rather talk? Call 0491 754 707.

Jake
STIKKYS Detailing, North Turramurra

I grew up on the North Shore, taught myself on my own cars and started STIKKYS in 2025. I work 7 days, 9am to 5pm. More about me.

Cover photo: Oliur Rahman / Wikimedia Commons (CC0). Other photo is my own work.