They didn’t ask how often you clean your fridge, they asked how often you clean it out, which I interpret to mean How often do you throw dead food away. Weekly. However, I rarely clean the fridge. I admit it.
That’s sort of a rolling target. Stuff goes in, other stuff comes out. I virtually never clean the entire fridge at one time. Spills get wiped up when they happen (or get noticed) food that gets to be unrecognizable/inedible gets tossed when discovered. We try to use the FIFO method of inventory control.
The previous owners of my house left their fridge, a really nice Kenmore Elite side-by-side. About 8 years into my home ownership, one of the light bulbs went out so I decided to replace it. The refrigerator side has two bulbs, an upper and a lower. The lower bulb is behind this plastic shroud that has to be removed. I removed the shroud and found a nice little present. One of those individually wrapped cheese sticks. Looked like one of these:
It was all shriveled and curved up, presumably from being so dried out, but it still looked like a cheese stick. No mold, and it was still orange and somewhat pliable. I have no idea how long it had been in there, but it had to be at least 8 years, because we don’t buy those cheese sticks.