Have you ever done the thing where you attack your greasy, dusty windows with a paper towel and a bottle of windex, and then they look all streaky afterwards and seem to almost immediately go back to being dirty again? Maybe you’ve bought into one of those “tips and tricks”, like using newspaper to clean windows, or buying super fancy cleaning liquids to try to get a streak-free finish. Or maybe you just let your windows be dirty because you can’t reach them. It can be surprisingly tricky to get your windows to really be fully clean inside and out, so here are some dos and don’ts for getting crystal clear windows to let in all the winter sunshine you can get!