Shooting the breeze at the LBS today and saw what I thought was a good idea. Hey it was 7f outside at the time, what else are you going to do? If this has been posted before, so be it.
Using a high speed rotary tool with a sandpaper drum attached to surface the brake pads. Other than some dust this was a fast and quick way to get rid of all the road gunk that tends to stick in the pads. Did it with the pads mounted and the wheel removed. They were doing a spring tuneup on a bike.