Can you do this in reality......just put some water on....water off scrub then rinse??
You can do it, however, I dont think its good practise nor professional. We did it to get away with going back to fill up. It meant we earnt another £50.00. and a saved trip going back to finish off the work at a later date (today).
It does also take longer that way, as you're fannying about with the tap and also takes longer to rinse off if you're trying to achieve the same result with less water.