Answer:
What becomes white when it is dirty?
Arnold Schwarzenegger has a big one, Michael J Fox has a small one, Madonna doesn't have one, The pope has one but he never uses it, Bill Clinton has one and he uses it all the time! What is it?
What's the difference between sanitizer and moisturizer?
What has a head, can't think, but drives?
What do spiders in Silicon Valley want to be when they grow up?
What did the piece of wood say when he saw the screwdriver and screws approaching?