Water damage on wall from hanging plants, water on bathroom floor because you allowed overrun or children to waste water causing damage. Dark patches of ingrained soil on hardwood floors that have lost their finish and have been worn down to bare wood Water stains on wood floors and windowsills caused by windows being left open during rainstorms. Furniture slid across hardwood or ceramic floors causing deep scratches. Stains on old bathroom ixtures that have lost their protective coating. Toilets, tubs, showers, enclosures, walls etc.
Soap scum builds up.
Use products such as TileX or other cleaner weekly. If when you move, perhaps find a day worker to clean. Use a nylon duster from any home store. Missing mini-blinds, bent blinds or otherwise damaged. Curtains removed and thrown out that were part of the owner's decorations.