If you meant to say not feces/urine, I have a idea or two... what type of enclosure is it? sometimes people mod enclosures or fail to provide enough ventilation and it takes on a musty old basement smell. This is to be avoided and if that is what is going on it is time to alter things as this is NOT a healthy environment at all.
The other is some plastics when enclosed have a funky smell all by their selves. If might want to clean and check every piece individually I'd not use any plastic giving off odd plastic odours.
If you have a couple of BPs is the same cage together (it is a touch unclear if they are together or in a divided cage or a single) it is generally not something a beginner should attempt.
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