This topic is somewhat subjective and dependson what, how, and when you're riding. But in my expirience, I've found it better to never over clean you bike. Not fairings and such, but removing grease, gunk, or other things that have built up that can stop dust and junk from entering from bumping around where it shouldn't be. I use my bike to commute almost everyday, rain or shine, so I try to keep it greased up pretty good, from pegs for axel, I slobber it on when I can. But some people might not ride their bike as hard, as often, or in inclament weather (track bike or Harley.) But just wanted to know what other riders thoughts are on the topic.