I took my Canon SD 870 IS to Burning Man and a couple uses after I came back, the lens wouldn’t retract anymore. Since the cost to repair these cameras is usually around $200 (close to the cost), I thought I would try to repair it at home.
Before I cracked the case open and attacked it with Dust Off, though, I Googled a solution! Banging the side of the camera hard against the palm of my hand was successful. Whoo!