Answer:
The dirtier I get, the whiter I am. What am I?
I go in dry and come out wet. The longer I stay in the stronger my surroundings get.
My first is high my second damp my whole a tie a writer's cramp.
I come with a train and go with a train and the train doesn't need me but can't go without me.
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
The answer I give is yes, but what I mean is no. What was the question?