Buying real estate that someone already owned before you, the so-called secondary, you assume that the previous owners may leave traces of their stay. The heroes of Cleaning Trouble - Edward and Deborah recently bought a house. They got them at a ridiculous price, but not because it requires some serious repair, that's just fine with that. The walls, roof, ceilings, etc. are in excellent condition, but the inside requires a lot of cleaning. Our heroes would have cleaned up before moving in anyway, but this time they will have to work hard and they will need an assistant. You can offer your services if you find yourself in the Cleaning trouble game.
