Answer:
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
Railroad Crossing, look out for the cars. Can you spell that, without any R's?
What word has kst in the middle, in the beginning, and at the end?
Who is the most foreign visitor you could imagine?
A hundred arms, a thousand fingers, but I have no eyes to see where I linger. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.