Answer:
I get wet when drying. I get dirty when wiping.
By Moon or by Sun, I shall be found. Yet, if there's no light around, I am undone. What am I?
I am asleep when you are awake I am awake when you fall asleep. I can fly but no feathers to aid my flight.
I cannot be felt seen or touched. Yet I can be found in everybody. My existence is always in debate. Yet I have my own style of music.
I'm sometimes white but most often I'm black. I take you there but never bring you back.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.