Thanks Jamie I will give it a go this Thursday. It is 2400sq Ft of empty office with a few minor stains. I am relatively new at this rotary cleaning side of it. The office is on the 4th floor so keen to see results. I will be using Dynamall. Full vac then pre-spray- 10 min dwell then do the rotary with fresh spray as I go?? I will revert to HWE if not looking good Reg