My filter is as clean as a whistle. I also don't put dishes with large chunks of stuff still attached in it. Shit/Crap is pretty much water soluble, so I can't imagine it floating around in there, at least not in chunks. Just rinse the carts before putting them in there, like you would/should do with dishes. If its a big concern still, run it empty with some bleach afterward. Dunno, the idea doesn't really repulse me.