To be honest, my first thought was the litter box. I scoop every day but am embarrassed to say how long it goes between complete changes.
But now that you bring it up. I don't even want to think about what might be under or behind my refrigerator!
I've been here over three years and have no idea how to remove the grate at the bottom or what is under there that might need cleaning.
But a couple of weeks ago I did clean out the lint filter that is underneath my dryer. The instructions say it should be cleaned out every three months to avoid a build up. I do the easy on on the door after every load. But the this one is a pain to do.
The first time was a shock. I had no idea one cat could generate so much fur!