Cleaning the screen:
The Polycade uses a standard PC monitor, so regular screen cleaner will work.
DO NOT use rubbing alcohol on your screen.
Cleaning the cabinet:
Whether you have the v1 (laminated wood) or a later version (powder coated steel), rubbing alcohol works great to clean the body, buttons, joysticks, trackball, etc of your Polycade. Just don't use rubbing alcohol on your screen!