Is it any good? I saw an advert the other day - a 'vanish' ambulance crew arrive to deal with a grubby carpet. They sprinkle powder and then vacuum it up to rapturous applause. The two-tone look where dirt meets clean at the edge of rugs is gone. Wondrous! Or is it? Do I need this stuff in my life or would I be better making the family spend the summer outside the house
or buying something better?