I mentioned scouring pads but was refering to wire wool not specifically scouring pads.
The photo above of the patios took 40 mins to clean, if you count the set up and put away time then an 1hr just straight power & hypo no need for anything else,
this is how you clean a patio, this is how companies who are powerwashing every day do it,
I've only ever heard tadgh mention scouring pads or any type of mechanical method, I'm a big believer in not reinventing the wheel if there was a better way to do it then the professional companies (who like I say are powerwashing every day, not doing the odd job now and again) would be using it, they are not stupid they are intelligent guys who know thier business.