Answer:
What looks back but cannot see?
Which button does not function when being pressed?
My first keeps time, my second spends time, my whole tells time.
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
What's black when you get it, red when you use it, and white when you're all through with it?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.