From the homemade telescope community I found a recommendation to use printed circuit etchant commonly sold in pint bottles for a few dollars. It is a ferric chloride solution and will stain most everything it contacts, also removes chrome plating from plumbing fittings, and damages stainless steel sinks. They also said 6%-8% concentration of HCL (hydrochloric acid) with a small amount of CuSO4 (copper sulfate) worked very well.
The mirroring serves a purpose to help cook things evenly by bouncing heat back into the oven with such a huge door glass insert, and since my oven has peeling mirroring that looks a little like tinsel hanging in there that I may try to even the appearance out by reducing the number of stripes to leave only undamaged ones...
The days are short and the night is long and the stars go tumbling by.. . ~Airstream~