I'm looking for a way to keep my window blinds from sliding down on their own. They run up and down the window on a cord at on either side. I have tightened the cord several times to no avail. Looking for something that I can place on the cords to stop the blind from going down on their own.
Couple of things to check. At the bottom where they fasten to the wall there should be a knot in the cord to prevent it from loosening up. In the top rail there is a spring that keeps tension on the cords which could have loosened and needs to be replaced.