I've used vaseline on the poles of bird feeders too to keep the squirrels off. Entertainment!!!!!!! But you have to wipe the grit off every few days otherwise they get "traction". So you have to clean & renew the vaseline.
I am a strong believer in the simple fact is that what matters in this life is how we treat others. I think that's what living is all about. Not what I've done in my life but how I've treated others. ~~ Sharon Brown