Bought it a few years ago from Q specifically because of the MBG - which wasn't needed. Despite the presenter saying to give it several weeks to work, OH applied it on January 2nd, it rained the following day, and the day after that our walls were like new again!
It's the one purchase that finally stopped OH stating that EVERYTHING QVC sold was crap.
He bought the shower version directly from W&F when he topped up (they often have good offers if you sign up), and that's been great for getting rid of the really stubborn mould around the silicone stuff. That took ages, though.
Well impressed with the original especially as our neighbour ruined their path with a pressure washer. He was rather smug when his path came up clean immediately. Wasn't so smug after the next frost worked under the damage the pressure washer caused and flaked the top layer of his paving off, just as ours came up clean and undamaged with W&F!