Something strange for the nest

I have been watching Mr. and Mrs. Starling collect stuff dor their nest, sometimes they get something really weird!

Mr. and Mrs. Starling collecting nesting materials

Starlings checking out the nestbox

Today a male starling was looking at the nestbox, he inspected the whole thing and looked inside. He called over the female who didn’t look pleased with it. (She didn’t even look inside) There is a wasp inside. We tried blasting it out with the hose yesterday, it left, and now it’s back. I heard that vaseline can help. Is this true and how do I prevent the wasp from coming back?

Immature Great-Tailed Grackles!

Immature Great-Tailed Grackles and European Starlings came to eat birdseed

I maxed out at five photos and have one photo left so please see the other photo!