just got a tn30 and couldn’t be happier with it. however, i noticed a few “smudge” spots on the outside of the lens (possibly from thread lubricant/fingerprints, etc.). tried to buff it out with a supersoft sunglass cloth, but i seem to be spreading it in a circular pattern rather than getting rid of it. is there a cleaning solution, such as eyeglass spray, that would take care of this? i already have a cleaning gel spray for my LCD tv- would this work? description says it has AR coating, so i don’t want to use the wrong stuff.