Answer:
I am black when I am clean and white when I am dirty?
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
Don't do this in the shallow end.
What can be forever wound up but never annoyed?
Upon me you can tread, though softly under cover. And I will take you places, that you have yet to discover. I'm high, and I'm low, though flat in the middle. And though a joy to the children, adults think of me little.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.