there is a how to clean your rams monitor on their radio site
pick your radio by clicking on it, radio ID is on the very bottom right corner
Cleaning Your Touch-Screen Radio
* Do not spray any liquid or caustic chemicals directly on the screen. Use a clean and dry micro fiber lens cleaning cloth in order to clean the touch-screen.
* If necessary, use a lint-free cloth dampened with a cleaning solution such as isopropyl alcohol or an isopropyl alcohol and water solution ratio of 50:50. Be sure to follow the solvent manufacturer's precautions and directions.