yea snake poo smell hits me right when i walk into a room... then it's the hunt to figure out who the culprit is. poo and urates over the heated side smells AWFUL! that constant burning poo smell just carries so far. if you're using bark just try taking a whole chunk out maybe? instead of just the pieces that are visually soiled. sometimes the urine can seep downwards and linger, leaving a smell.