Zippy Green is useless - Huge *******

I saw a demo of what Zippy Green is supposed to be able to do and clean stoves pots etc at the Rand Easter Show with little effort. I bought some (R200 for 3 bottles) and to my disappointment, other cleaning agents 30% of the price works much better that the Zippy Green. I had to treat the section 8 times and scrubbed so hard and still it was not clean. I then used some other cleaning product for the other half with less scrubbing, got it cleaner.