Yep, was on a 156 to Matlock yesterday - impressed to see an onboard cleaner the whole trip, but then I noticed all he really did was walk up and down the unit as far as I could see. During course of journey table seat opposite me 'changed hands' 3 times, with gaps in occupancy in between, with cleaning spray in hand the chap walked past it several times and missed the chance of giving it a wipe at any time. Never wiped any seat back handles either. A wasted resource as far as I could see, I am sorry to say.
But not always so - a few weeks ago I was on a London bound EMR service and an on board cleaner was persistently walking u and down spraying touch points and seat back handles / tables as she went along.