When I helped my parents move, I scrubbed their house from top to bottom - even wiped down the internal doors and got rid of finger marks on the walls, culminating in scrubbing the parquet in the hall as we backed out of the front door.
It was filthy within about 30 seconds of the new buyers walking in.
Parents think I was insane and should not do the same with our house (we're hoping to complete in a few weeks).
I don't want people moving in to a dirty house and thinking I'm scummy dirty 
So, how far do you go with the cleaning?