Three weeks into burning our new DS 1500, it was obvious a glass cleaning was needed. Haze and a little fly ash were getting very noticeable.
After reading this entire thread, I decided to try the non-chemical methods first. The idea of using ash on a damp cloth sounded a lot like the "hints from Heloise"-type cleaning tips my wife is so fond of--most of which are pretty darn effective--so I decided to give it a try.
Before this morning's shakedown and loading, I wiped the glass down with two applications of ash on a damp, wadded-up paper towel, with a rinse in between using a clean, damp paper towel with water only. Then followed with two rinsings with clean, wet paper towels and drying with a dry paper towel. I also used a damp towel (water only, no ash) to clean the outside of the glass. I couldn't believe how well this cleaned the glass.
It was so clean, after I was done, it was hard to tell there was glass there at all from several feet away.
And the whole process was low-mess...didn't even have any ash to clean up off the floor, and just a few paper towels to throw in the trash.
Back in the old days of burning a Franco-Belge, I had a "heat shield" to hang over the door opening when cleaning the glass. This was a piece of heavy sheet metal, sized to fit the door opening, with the top edge folded over into a "lip" that hung on the top rim of the F-B firebox opening. This kept gasses and heat in the stove while you let the door cool for cleaning. The local F-B dealer had this made at a local metal shop, and sold them as an accessory.
For the DS, I made my own "heat shield" out of three layers of heavy-duty aluminum foil, folded over at two opposite edges to keep them together. After opening the firebox door, I held the foil blanket over the door opening and molded it around the lip of the door opening with my (gloved!) fingers. The foil appeared to be sucked inward a bit by the stove draft; anyway, it stayed in place throughout the 10-minute cleaning. The CO detector mounted just a few feet from the stove read zero the whole time.
I'm sure the glass won't always stay this clear; as many on here have pointed out, pitting and discoloration are to be expected over time. But the ash method is cheap, effective, and low-mess. I may pick up some of the Rutland cleaner several of you mentioned and give that a shot--leaving a silicone coating on the glass to protect from ash effects sounds like a good idea.
Attached are a few pics showing my "heat shield", and the view through my nice, clean glass!