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Use a LCD computer display spray cleaner; "Pledge Electronics" for example. Gently polish dry with a Soft cotton towel. Use one washed without any softener. The surface will scratch, so be gentle. I turn the car so the mid day sun reflects on the panel when I clean mine. Then dust up with a microfiber "clear dash plastic" cloth (light blue) purchased at PepBoys or CSK Auto. They work very good.
The best thing to clean the navigation screen is an eyeglass cleaner using the lint-free cloth that comes with it. You can purchase it from any sunglasses hut or some store like that. I tiwill clean it in less than 3 seconds with wonderful results and is recommended by the manufacturers.
I use Klear Screen on all my flat screens. Great stuff that is safe and effective.
Klear Screen and iKlear are the only formula used, sold, or recommended by leading manufacturers such as Apple, Dell, Sony Vaio, HP/Compaq, Fujitsu, IBM, Panasonic, Samsung, Sharp, Toshiba, and ViewSonic.
Prolonged use of ammonia based or alcohol based cleaners will permanently damage your screen or cause it to yellow.
Klear Screen and iKlear contain a unique 3-step liquid polymer-based formula that LIFTS and DISSOLVES surface contaminants and fingerprints, floating debris off the screen surface, leaving an ANTI-STATIC coating which dramatically reduces surface friction & wear, resists fingerprinting and provides a renewable protective screen barrier.