Something's Rotten in the state of Kenmore

Something in my kitchen smells really gross, and I can't figure out what it is.

This happened in my dorm during my first year at university. This horrible smell just kept getting worse for several days- it smelled a bit like gross old cat litter with rotten something mixed in, but we didn't have a litter box- or a cat. We eventually discovered several potatoes that were rotting in a cupboard- I never know that anything so comforting and delicious could degrade into something that smelled like slimy death.

It's not potatoes. I had a few that were sprouting, and I tossed them in the compost just to be safe. No good. I've been obsessively emptying the garbage and the greeen compost bucket from under the sink- still smelly. I've cleaned out the fridge. And the freezer. And the cupboards. I emptied the recycling boxes (actually old diaper boxes, which don't hold much- I want these), and while the bottoms are a little slick from The Great Vegetable Oil Spill of 2009 (you should've seen the poor ducks!), they're not stinky.

I've cleaned out the litter box several times, even though it a) is not in the kitchen, and b) smells nothing like the smell that's haunting the kitchen.

Next stop: sterilize the you-know-what out of the aforementioned garbage can and clean the drains.

Wish me luck.