Best Car Dehumidifier UK (2026): 5 Reusable Picks

On the dashboard near the windscreen is the most popular spot, on an anti-slip pad so it cannot slide. A second bag can go on the rear shelf, under a seat or in the boot. Make sure it can never slide under the pedals or block your view.

Follow the maker's instructions. Hillington says wrap the bag in kitchen paper and microwave it for 5 minutes. Pingi says two goes of 6 minutes. Tanness says 8 to 10 minutes in the microwave or 2 to 3 hours in an oven at 60°C. Let it cool before putting it back, because it will be hot.

When the indicator changes colour. In winter that can be every week or two in a damp car. Hillington suggests about every 30 days. In a dry summer it can last much longer.

For most cars, a 1kg bag on the dashboard is a good start. Two 1kg bags suit a bigger car, a van or a camper. Small 250g to 350g bags are best for gloveboxes, door pockets and small cars, or as an extra to a bigger bag.

Warm, damp air inside the car meets cold glass, and the water in the air turns into droplets on it. Wet coats, umbrellas, damp mats and breath all add moisture. A car dehumidifier, dry mats and running the air conditioning on the windscreen setting all help.

They do different jobs. Air con dries the air while the engine is running and is the fastest way to clear a misty windscreen. A dehumidifier bag works while the car is parked, so there is less mist to clear in the first place. Using both works best.

Yes, in small spaces like a wardrobe, a cupboard or on a windowsill. For a whole damp room, a bag is far too small. See our best moisture absorber UK guide for tubs, or our best dehumidifiers UK guide for electric dehumidifiers.

They hold no loose liquid, so there is nothing to spill. Silica gel beads should not be eaten, so keep bags away from small children and pets, and check for splits. Do not overheat bags in the microwave, and let them cool before handling.

Some help with musty smells caused by damp. Hillington says its bags absorb odours as well as moisture. If the smell comes from a wet carpet or spilled drink, you need to dry or clean that first.