Answer:
I am made by nature soft as silk; A puffy cloud white as milk; Snow tops this tropical crop; The dirtiest part of a mop.
I am the kind of soda you must not drink.
Break me and I am better, immediately set and harder to be broken again. What am I?
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.