For the dust I keep a swiffer duster in the center console. Just wipe screen down a damp cloth now and then with windex on the cloth.

 

NEVER use window cleaner, especially an ammonia based one on your touchscreen, EVER!
The only thing you should ever use is a microfiber and a tiny bit of water. Chemicals will destroy the coating on the screen. Even rubbing alcohol.

 

Simple standard Eyeglass Sunglass cleaner spray and very very fine microfiber cloth.
Usually for sunglasses.

 

When in doubt, just distilled water and micro fibre cloth .

Don’t bother with chemicals as it’s a high touch surface and you’ll get it dirty again same day anyway.

 

Meguiars Quik Interior Detailer cleaner sprayed on microfiber and only gentley glide. This is how I do it.