Dreaded clunk when turning

Another question, how do you go about flushing out the differential with it on the car and jacked up?? I waved a magnet in there and tried to get the shavings, but is there a better way to flush it all out?? I have an air compressor.
I drilled and taped a drain hole in the housing to help get all the crap out and preform regular maintenance.
With the axles out I use a broom handle to push rags soaked with brake cleaner down the axle tubes.