I have to admit I'm a little OCD when it comes to windows. I have tried every name brand window cleaner out there. The cleaners all promise to be the best with no streaking (B.S.). I hate streaks/smears and spots on my windows. Today I found a cleaner that is the best and the cheapest for a true spray on wipe off no streaks/smears or water spot cleaner. I picked up a quart of DENATURED ALCOHOL from Lowes for $7.00. Mixed 1 oz with 11 oz of tap water in a spray bottle. Sprayed on the windows (did not run down the window just stayed in place) wiped with one side of the cotton towel, turned the towel over and wiped clean. I tried rubbing alcohol which kind of worked but this DENATURED alcohol is the shiznet! No more streaks or smears. Mixture works AWESOME. Quick, easy, and cheap. This is new to me so I thought I would pass it on.