This video is to maybe help shed some light on something i get asked everytime i go out riding, and that's "HOW DO YOU GET THAT THING SO CLEAN?!?!?!" I hope enjoy and maybe this will help you out!
WD-40 will degrade the plastic over time, making it brittle and crack. If your plastics are a light color/white it will yellow them. Better to use a silicone based lube/coating.