Silicone Spray

We use this stuff on our shower curtain bars, door hinges and any place that spiders want to spin their webs.  But the best use recently was getting a metal cocktail shaker unstuck. A couple squirts ... wait for it ... and it easily slid apart.  Simply amazing stuff.

http://www.amazon.com/Kelloggs-57500-Pure-Silicon-oz/dp/B000BXOFJI