After seeing what the Purple Stuff did I set up a plastic pipe capped at the bottom and filled with the Purple Stuff. I then hung the straight price of trim on a wire and hung it in the pipe.
Here it is after 30 minutes:
And after 2 hours:
You need to check this solution frequently and use a Scotch Brite pad or 0000 stainless steel wool to scrape the anodized crust off of the surface. This allows the chemical to get a better bite at the surface and continue the process. The Purple Stuff does work very well and very rapidly but seems to reach a point of diminishing returns after a few hours.