It's very interesting the instructions are pretty clear on a few points:
1) Use a microfiber cloth.
2) Do not use ammonia. I think any ammonia free glass cleaner will due.
3) Do not spray the cleaner on the glass. Spraay it on the cloth, then clean the glass with it. I think this is due to the coated nature of the glass and trying to keep the glass coating intact for as long as possible.