I used a propane torch to heat up the aluminun trim until the soot burned away. This is a relatively easy process.

Be sure and support your trim pieces evenly about every 2'. Move the torch slowly and evenly until you see the soot burn away. You can damage the trim by getting it too hot so be careful. And remember, this stuff gets HOT! Let it cool before picking it up.
Annealing the Edge Trim