How can I remove Vaporub from the inside of my humidifier? There is no chance of me getting inside it.
I clean my humidifier with a diluted bleach solution.
You may want to try wiping the inside of the humidifer very thoroughly with a clean rag or paper towel soaked with rubbing alcohol, which cuts through greasy substances very well [usually at least]. You could also wash the humidifier tank with dish liquid [I've found Dawn especially effective when it comes to grease]. Whatever you use, rinse very thoroughly as well. Good luck!
This will probably take several cleaning since you cannot get inside your unit.