Keep yellowjackers off your hummingbird feeders by using PAM

I had a terrible problem with swarming on my hummingbird feeders this year, and finally googled “swarms” & “hummingbird feeders”. This was the main suggestion: spray with PAM. Spray around the feeding spout or tube. It does not affect the hummers, as they actually insert their bills for feeding, but the bees, wasps, jackets, etc., cannot stay on and will slide right off.