Make sure all the moss and debris is off the window, you can flip the window right round into the cleaning position to better access the external glass and clean it. here's a video that shows the cleaning position etc https://youtube.com/shorts/8W4G-1zFTRE
Make sure all the moss and debris is off the window, you can flip the window right round into the cleaning position to better access the external glass and clean it. here's a video that shows the cleaning position etc https://youtube.com/shorts/8W4G-1zFTRE
Trust me it makes it a whole lot easier.