Burning wood is a dirty business (wood debris on the floor, ash debris spilling during cleanout, occasional smoke spills into the room, etc) that results in a bit of wear and tear on your house and stove. After 20 plus years, my stove has chips in the enamel, a bit of cloudiness to the glass and a repaired hinge seat. At one point, I thought it'd be nice to have crystal clear glass again...I wiped, cleaned, polished with some cleaner...it got somewhat better. Then I decided my time was better spent on other things than cleaning glass every other day....the glass maybe gets wiped off once or twice a year. Aging and the imperfections it brings are normal.