Ideally, sash windows should be cleaned twice a year, but it‘s a task most people tend to think of as spring cleaning. When you do clean your sash windows we recommend you don‘t clean your sash windows on a sunny day. This is because the sun will dry the soap on the glass and leave water streaks on your sash windows. To avoid this problem, better choose a cloudy day.
If you‘re using paper towels and glass cleaner for cleaning your sash windows, you are doing it wrong. All that rubbing isn‘t a good idea as you‘re just moving the dirt from one place to another and additionally creating a static charge on the glass, which attracts even more dust and dirt.
To clean the inside of sash windows we recommend a glass cleaner and microfiber cloth. This should be enough because inside sash windows are usually not as dirty as they are on the outside. For outside cleaning of sash windows you should choose a dishwashing liquid mixed with water and use sponge. And then simply squeegee the solution off of your sash windows. This is pretty simple and does not lead to lots of dirty paper towels going into your waste bin.