I wanted to pass along something I posted on my page a couple of days ago. For "Car Guy's (and gal's) that show their cars, this is common knowledge. I don't know why I didn't pass this along sooner.
When you are polishing up a machine, the best material to use is a 100% cotton cloth like an old T-shirt. But don't use one that has been treated with fabric softener. Even the dryer sheets will cause streaks and "oily" spots. This is especially noticeable on black machines. The same goes for waxing your car.
~G~