OK, these are what the pans in Post#228 looked like 'before': Got these free at a garage sale - will go in the oven next time it goes through a 'self-cleaning' cycle.
*NOTE* (sorry, can't go back and edit posts older than 24 hours anymore!)
The aluminum pans (Post #229) came out better than the steel pans shown (Post #237)! The aluminum ones were cleaned down to the bare metal. Apparently, the steel pans had some type of coating that was burned off (?). They are still suitable for shop use, but I would not use this cleaning process for steel pans that you intended to use again for food.
Philbert