Answer:
What's made of water but if you put it into water it will die?
I get wet when drying. I get dirty when wiping.
I am a protector of the scoreboard.
When I am caught I am thrown away. When I escape you itch all day.
I am rarely touched but often held. If you are smart you'll use me well. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?