Good screen Guards for N900 ( Fingerprint Issue )

I have a small issue with my smartphone. Using such a powerful device is indeed a treat, but occasionally I face some problems due to accumulated dust, Finger Prints although can be wiped off. Yes, a small cleaning fabric is given to wipe off but that's way out of the question for quick detour or when you're in a hurry. Of course i can wipe it with any cloth or even my fingers.

The general functioning of the device are sometimes altered or you can say leggy. Not always but sometimes. So i would like ask, whether there are any such tough screen guards to give it an overall protection.