It's no secret that cars can steam up during the winter months as a result of the changing temperatures but, little you may know, there's a simple thing you can do to prevent it. Drivers have been urged to place an unlikely item in their cars to stop the problem and ensure their vehicles are free of condensation in December.

When you find out what it is, you may be quite surprised, but drivers have been raving about the hack on Reddit. Not to mention, it's also approved by experts, with car gurus encouraging people to fill a sock with the product and telling them to place it in their cars.

It's not the only trick you can use to prevent your car fogging up either. Previously, the RAC also shared that removing one item from your car could help better the issue too.

A driver posted: "Keep a sock filled with cat litter inside your car to avoid winter frost. Growing with harsh winters, inside frost is what I consider the worst. Doing this prevents the inside of your windows from fogging up and [helps to] avoid that annoying inside frost.

"The litter will absorb the moisture created from the melting snow inside your car, avoiding the humidity from sticking to your windows and [freezing] overnight. Simply fill a cotton sock with litter, tape it shut and leave it in your car. Place it on the dashboard for best results."

While the trick may seem a little unlikely, it turns out it does work. In fact, it's recommended by vehicle breakdown service Start Rescue.

The website states: "A cheaper but equally effective way to help reduce condensation on car windows is to fill an old sock or pair of tights with cat litter. This may sound like a strange solution for dealing with car condensation, but the clay particles in cat litter are excellent at absorbing excess moisture from inside your car."

To do it, you just need to fill a sock with unused, moisture-absorbing cat litter (crystal or non-clumping clay is recommended) and fasten it shut. Then, place it on your dashboard or under a seat to act as a dehumidifier.

The product is designed to absorb liquids and, by drawing moisture out of the car's cabin, it will help to stop condensation from forming on the windows, which is what causes fog. It's as simple as that.

Just remember, if you suffer with condensation regularly, then you'll need to replace the litter monthly or when it appears to stop working. At some point, it will become saturated.

After the trick was shared on Reddit, many people chimed in with their thoughts. It seems to be a popular way of stopping condensation forming in vehicles.

One person said: "This is a great idea." Another added: "This is interesting. I never thought about this, thank you!"

A third replied: "That's really awesome! Thanks. Inside ice is the worst." Meanwhile, a fourth also commented: "Good tip. We're on our third winter of this."

Someone else also responded: "I need to do this. I bought one of those self-contained anti-humidity things, but I've also heard this works. Plus, it works really good if you use that silica cat litter stuff."

If, however, condensation has become such a problem that you struggle to control it, contact a mechanic for professional advice. They'll be able to guide you further as to what's causing the issue.