NOTE: If your exhaust is scratch-free, just stick with the autosol + MF cloth. Mine was so thoroughly choked up, I had to use all ten steps to clean it.
The exhaust, like the wheels, is something I do seperately to the rest of my detailing as it's a lot of work involved. I last had to use the 10-step method back in Feb, after four months of no detailing. When I detailed the car a coupla weeks ago, I just used wirewool on the inside of the tips rather than the outside.