Who knows! I'm sure it's going to prove to be the solution to every gruesome corner of my house - but then I am a total sucker for cleaning products. I always forget that each and every one needs elbow grease as well. I've searched Tesco's, Co-op and Summerfield to no avail. I'm off to Waitrose and Sainsbury's tomorrow on the hunt.
Sainsbury's at Bells Stores sell it (but you may have to live in the North East for one of these). When I first saw the ad I wasn't sure if it was genuine. Must have cost all of fourpence to make.