The old pet store I used to work at that doesn't exsist in this city anymor Pet Paradise. I was in the rodent room and I had to clean cages every day and make sure everything was healthy and had fresh water and enough food.
This was when I was young. I remember one time, leaving a bit of parrot poop on the parrots water dish but I put it back in anyways and the manager glared at me, picked up the bowl and said, "Would YOU drink from this? Treat each of these animals as if they were you, if you wouldn't drink from the water dish, eat from the food bowl or sleep on the bedding, then neither should they!" And to this day I think that was the best advice any manager has EVER given me on pet care.
"A rattlesnake that doesn't bite teaches you nothing."