Answer:
I describe a toilet cleaner as well as one of Santa's reindeer
I suck.
I am the reaction after enjoying soda.
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
The more you work, the more I'll eat.You keep me full, I'll keep you neat. What am I?
No matter how little or how much you use me, you change me every month.