Oy. Good thing no one ever checks my oven, it's a disaster that we inherited and I can't possibly clean!
I do think of that sometimes though - for example, when we moved into our house, there were food spatters all over the white cabinets, and I thought, gosh, the previous owner was DIRTY. And then a few weeks later I glanced down and my cabinets were already spattered again after just a few weeks of cooking. I'd just never had a kitchen with white cabinets before... didn't realize how quickly they could look bad!