(27 Nov 2015, 6:49 pm)R852 PRG wrote What exactly takes place when a bus receives a deep clean? I'm guessing the seats and stuff?
I'd suggest that the level of 'treatment' ultimately depends on how much money the company is handing over.
In the past, Thornton's have used some pretty heavy-duty cleaning materials. If I recall correctly, it was the articulated vehicles which had to stand for a few days just to get rid of the smell, as it was so strong. I had a bit of a snoop around 5252 not long after it was first done, and the distinct smell previously found on vehicles which had received a deep clean was not evident. The seat moquette did appear to be a lot cleaner (so was presumably washed properly), and there was no longer any grubby marks left behind from previous internal branding which had been removed.
The usual clean vehicles receive each night involves mopping down the vehicle with soapy water, and sometimes a quick dust over. In my opinion, vehicles ought to receive a deep clean on an annual basis. It would coincide nicely with when the vehicle is off the road for annual PSV test, but I'd guess that cost may prevent this.