Just use Windex (ammonia-free if you have tinted windows) or whatever's handy; it's all in your technique. Just spray the window down, and wipe it thoroughly with a paper towel. That done, grab a dry paper towel and go over it again. Should do the trick. If it's really humid where you are, you may have to go over it another time, but that should get the job done.

Best of luck, Michael
'92 500E
'88 300TE