I just had a guest who complained of lack of proper cleaning. He sent pictures to prove it. Here is his picture of the top of the cabinets. I believe they are 7′ (2.13m) above floor level.
I told the cleaners that this was proof that they were doing a great job. If a guest had to go to that extreme to find something to complain about, then clearly they were doing a great job on everything that matters.
He also sent a picture of under the bed, under the kitchen sink, and white residue on a glass from the dishwasher.