Black Capped Chickadees

I really enjoy these little things. I usually have a healthy population but here lately the bees have been moving in and taking over the nest boxes. I usually just spray them down with the hose and then clean the nest box out but does anyone know a better way to keep the bees out?

I read on the Sialis or somewhere else that rubbing walls of the nest box with Vasilin helps to keep them out - their nest does not stick then. I should try it too. No wasps here yet.

Not sure how I missed this post but grosehexe is right, that should work well.

Welcome to the forum Grosehexe.