Most air fresheners are designed to last between three and four weeks before they need replacing but longer-lasting products are available but will cost more. Single-use products like freshener bombs may well last for a couple of weeks but aren’t designed to smell good for long periods of time. What do you want it to smell like?

The general rule of thumb is to first make sure your windows are closed and the air-con set to recirculate. Then, you place the air freshener bomb centrally in your car, set it going and make sure all the doors are closed. You’ll probably have to wait around 15 minutes for the car to fill, after which you should open your doors and allow the smoke to dissipate. All that’s left to do after that is enjoy the nice smell. Why would I need one? A car air freshener bomb is essentially an aerosol that won’t turn off once activated. If you’ve ever gone paintballing, it works a bit like a smoke grenade; you pull the pin and smoke comes out until the vessel is empty. Unlike a smoke bomb, however, this smoke will leave a nice smell and remove bad odours. How do I use it?