I use wet baby wipes or wet paper towel for cleaning furniture. Dont use organic solvents like aceton as that may disolve some plastic materials. Power all off before, let It dry once clean and shiny. Leave It fir night not used to let It dry. You can also use spray with air. When people show off their quads on photos those are likely cleaned, after repair/full disassemble or new. Nothing wrong with having damn dirty one if it's used. You will clean it after you break something anyway;)