Most stuff is easily wiped off with a clean dry microfiber towel.
Once in a while I'll spray some Invisible Glass on a microfiber towel away from the tank, then wipe the glass down with it.
I struggled with this for many months. Water, water/vinegar, windex, etc. I was never satisfied, until someone here recommended Kent Marine Acrylic and Glass Cleaner. It is the best thing I have used. It may appear expensive, but it is not. The bottle last for long time.