Windows are one of the most unforgiving surfaces to clean. If you leave a little smudge on most surfaces, it is typically hard to see it unless you look at it from different angles. That is definitely not the case with windows though! But tackling those pesky smudges, streaks and fingerprints can be easier than you think. With the OctoClean tricks, you can start cleaning your windows like a pro in between your regularly scheduled professional cleanings.