Try to stay away from any type of cleaner. instead try a cloth like this:
http://www.amazon.com/4-Pack-OVERSIZED-Amazing-Microfiber-Cleaning/dp/B00IFEERU2/ref=lh_ni_t?ie=UTF8&psc=1&smid=AJ0XJ8CMXDIU6
Many similar types out there will work. Great on the switches and iDrive dial and buttons. You can wipe down the screens and switch gear in a minute or two, easy.
If you do have something on the displays that won't wipe off try this or similar:
http://www.amazon.com/Belkin-F5L034-Screen-Cleaning-Kit/dp/B001NIEK3Q/ref=pd_cart_bxgy_2_p?ie=UTF8&refRID=0MZSK4EP1DMWM4WZ9TSH