Both types on deal at Bristol.

tip : use a small amount of shaving foam and gently polish off with a clean cloth/microfibre, works as well as any rain-x type product.

Good for bathroom mirrors too.

Surely as long as you're using exterior air and not recirculated you won't get fogging?!

shaving foam works, nice smell too!!!

fill a sock with cat litter, tie the top and chuck it under a seat. No more fogging!

On a dry day and when there is no moisture on you windscreen, just used neat fairy liquid on the inside of your windscreen and buff untill clear.

It's also important to use the correct fan settings in your car, so using full heat on a frozen windscreen but reducing the temperature once you have a clear screen.

Leaving the windows open (slightly) will also help, especially in between drives as built up moisture from the heater can leave the vehicle.

Mythbusting video from ChrisFix: How to Stop Car Windows from Steaming Up

I tried this a few years ago and it just froze on the inside of my windscreen so was a complete waste of time, I would just save your money and not buy it.

​now then, this sounds a much more intetesting subject... certainly need good lights when flashing them in dark places, so I've been told.

Utter garbage does NOTHING I've applied it & applied it & cleaned & applied it and the car STILL FOGS UP

Waste of time

This is way cheaper than adding fog lights as an optional extra, so heat added.

Used this on our cars... utter rubbish... sorry.. the outer rain-x stuff is great, this is crap.