Answer:
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
What is made of wood, but can't be sawed?
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
Why did the stadium get so hot after the game?