non-smear glass cleaner

I have tried several cleaners on my glass windows and display cases but end up with smears. I use a cloth, which I found worked better than paper towels, to clean the glass and then come back with clean dry rag to polish out the smears. But i can never get them to go completely and when the light changes throughout the day, they can look really bad at some angles.
I have used the usual, like Windex and such, and one formula from Consumer's Reports which is part vinegar, water, a little surficant (I use Polmolive) and a little lemon. Same problem.
One possible reason is that I heat with propane part of the time and it leaves a brownish film on everything. So I try not to use it much; only when the heat pump is not enough after the temperatures get below 20 deg.
Any suggestions would be appreciated.