DO NOT put anything oily or greasy on the egg!!!
This is what they do in the wild to kill eggs.. Of any kind.
When seagulls or cormorants become a pest, FAWS coat their eggs in petroleum jelly to suffocate them.
My guess would be a misting with hot water?
Don't take my word for it, I've never dealt with this in person, but I know for sure that oily and greasy things are not good for eggs.