We did our first burnoffs of the new PE Alderlea T5 this summer, and last week the morning temps were low enough that we actually got to use it! I am loving this stove! So much nicer than our old woodstove or pellet stove... the way this thing burns is amazing! It really holds the coals and the stove itselfs retains heat for such a good long time. Anyway, on to my question... the user's manual says we should use fireplace glass cleaner... is this really necessary? I don't anticipate a lot of dirty glass, but don't want to invalidate my warranty by using a product I shouldn't. Typically I would probably just use vinegar or ammonia and water, but could this possibly be damaging and a bad idea?