Appliances are to be clean inside and out. Since most non-performance letters concerning appliances are for the worst case scenario it is really hard to imagine that these were just overlooked. On the contrary, since cleaning out appliances can be a disgusting job at times, it is more likely that the task is just not dealt with. I’m talking about mold and/or rotting food in refrigerators and freezers.
Take photos of the interior of all appliances every time you visit a property. Don’t forget to check ovens and dishwashers. Some homeowners have left food in the oven and dirty dishes in the dishwasher which will turn into a big moldy mess over time. Make sure you have found all appliances like the food freezer down in the basement.