When I'm on top of things, the frig gets cleaned out once a week--right before grocery day. When I'm not on top of things (more often than not), it's more like 3-4 weeks before it truly gets cleaned out. That's way better than it used to be, which was about every 1-3 MONTHS.
I have a way to keep the frig (almost) PERPETUALLY CLEAN!
Here's the idea (are you ready?): Divide your refrigerator into "zones!"
What I saw when I looked in the frig tonight was that it has five areas--Top shelf, Middle shelf, Bottom shelf, Drawer, and Door. I quickly assigned each area a day (during the week--I take the weekends off) and will clean that area, or zone if you will, on its assigned day.
Genius. Pure genius.
Okay, I'm sure someone else has already thought of this, so I guess it's actually someone else's genius. The important thing is that I have finally put two and two together and I've come up with CLEAN!