Glass on Pellet Stove Front

[Robzheat]

The glass on my pellet stove is mirror front (Harman XXV) while cleaning the inside with regular glass cleaner, I noticed there where some spots I couldn't get off, after looking at them closer, they appeared to be some type of tempered heat marks of some kind, maybe from the air movement. Has anyone noticed these on there glass doors?

 

[moog5]

The same thing happens to mine. They look almost as if they are on the outside, and something that can't be cleaned. I first noticed them when the stove wasn't running (the reason I thought the marks were on the outside). I was pleasantly surprised when they came off after I cleaned the inside of the glass.

P.S. Your install looks great. Makes me want to talk the better half to going back to black.