Where the problems actually accumulate
Behind and beneath the fridge, where spills run and are never seen. Inside the microwave, particularly the roof, which nobody looks at. The seals on the fridge and dishwasher doors. Under the sink, where a slow leak develops into a smell long before it develops into visible water. The back edge of the bench where it meets the splashback. The undersides of cupboard handles, which are among the most handled surfaces in any building.
None of those are visible to somebody standing in the doorway, which is why a kitchen can look perfectly acceptable and still be the source of a persistent complaint about smell. It is also why an inspection based on how the room looks provides very little assurance. The check has to involve opening and moving things rather than surveying the room. The check has to involve opening and moving things rather than surveying the room from the door.
