i love my california duster...
(the trick is to know when to use it)
as for keeping it clean...i keep a duffle bag of supplies in the trunk...
-microfibers of different colors for different supplies
-meguiars wash & wax anywhere spray
-meguiars ulitimate detailer
-AA wheel protectant (like a wheel clear coat)
-Blue Magic tire shine
-invisible glass (and shop towel roll)
-headlight restore (to keep the headlights looking new)
so yeah just some basic stuff for use when needed