Another solution are Screen Protectors, I am actually in the process of finding one for my X5 Navigation.

Its a thin clear film that you put on your screen, doesnt stick, doesnt mess up your screen, and also reduces glare. So far I have found one that reduces up to 80% glare and another for 90% glare.

I am still researching, but when I find out more, I will let you know. Or if anyone has tried this, please let me know. Thanks and good luck! =)