This feeder was very innovative looking and it held liquid without leaking. I would suggest getting a stronger/newer suction cup for the product as the one that came with mine was a little yellow/opaque and seemed sort of like it was hanging around for a while. I decided to use it anyway since I had no other cups on hand. I cleaned the outside of my window with an all purpose cleaner and wet the suction cup with a little water. It held up for the first day, but when I came home the next it had fallen off of the window, the bottom piece (which is really two pieces) came apart at the seem and the part that attaches to the perches had cracked. On top of that, the little plastic piece that held the two clips on the back had also been broken off in the fall.