I just discovered this stuff yesterday. I'm amazed I'd never heard of it before as it's been around for over a century. And cheap too, a $2 can will last me a very long time unless we start using it on other things, and even then it will last.
Anyway I used the powder on my Blichmann kettle to get the burnt on crud off the bottom that I gave up on ever removing. I followed the directions on the can and no scrubbing was required, it just wiped off. I rinsed thoroughly and wiped it with a paper towel to dry it, but it was still damp. My wife was amazed at how shiny it way. I only did the inside, now I'm going to do the outside too.