Just a bit of fun, and maybe also to make me feel better about my housekeeping 'skills'...
...if you are a cleaner, or employ a cleaner who tells you these things, what is the worst house you/they have ever cleaned?
One of my lovely cleaners told me about students who needed a sudden clean as the landlord was coming over, and she just had to bin virtually the whole kitchen, saucepans, plates and all, as everything was crawling in maggots. Bin bags had never been thrown out and had just pulled up to shoulder height along one wall.
Do share! But make sure they are really awful so I don't wonder if it is me you are talking about...