With both sashes open, you can easily clean the exterior glass and remove any debris that has collected in the window frame. When you’re finished cleaning, work in reverse order to replace the sashes. Simply tilt the top sash back up and push it forward into the frame until it snaps into place. Then, fully raise it to close the sash. Repeat with the bottom sash and you’re finished!
NOTE: If the window sashes do not close properly into place, they may need to be squared-up in the frame. Tilt the sash back in, and ensure the bottom corners of each sash are level in the frame, then try raising the sashes into place again.