I have an elderly Peugeot 206 and it was misting up terribly. Eventually realised that the rear windows weren't quite wound up tight. Corrected that and bought a bag of silicone (like the stuff they put inside packaging of TVs & phones) and left it on the dash. It completely solved the problem. Available on eBay or Amazon and wonderfully effective. You can pop it in the microwave to dry it out as necessary.
Silica Gel, not silicone. Can be dried out by putting in the oven after cooking your dinner, place on radiator indoors, in airing cupboard.
Thanks for the clarification. The product has worked wonders in my car.Silica Gel, not silicone. Can be dried out by putting in the oven after cooking your dinner, place on radiator indoors, in airing cupboard.