What's the secret to streak-free windows?

[Dopler174]

I just use bare newspaper. No cleaner. (this does not work on tinted windows.)

 

[BSlusser]

Stoner's, terry towel to dry, terry towel to buff. Never in direct sunlight, but there has to be enough light out to where you can constantly check in the reflection. Avoid doing it at night when temperatures approach the dew point.