1 week ago 1 week ago “Let’s see… I wonder how this works.” by LolSnaps 1 week ago1 week ago ADVERTISEMENT Post PaginationPrevious PostPreviousNext PostNext Like it? Share with your friends! 16 16 points Chris Thomas so close… Martin Kamenov Georgiev Technically, this product was not designed to be used like this, but also technically, this IS the better way to use it because it would deflect the Sun’s rays before they got inside your car. Nick The sun heats coloured objects, not air, so if your windscreen is clean, the sunscreen on the inside works fine. Martin Kamenov Georgiev I doubt it’s as simple as ‘sun does not heat air’ but even with this in mind, no modern car has a truly clean windscreen, they are always enriched by layers of gobbledygook which I’m sure helps in keeping the Sun’s heat stay in your car.