So the pine trees (I think) have been dumping green particles all over the cars and street around here for the past couple of weeks, so I've been using an older California Duster I found in our closet. It removes the dust and particles, but its also looks like it is smearing something on the surface of the car. It's very very light and can be buffed off, but I didn't think dusters were suppsed to do this. What could the problem be? Should I clean the duster? What is the cleaning process for cleaning a duster?