Never used that Fast Fret as I was concerned that I'd get used to it then couldn't play with out having some. Prob from addictive experiences, you know what I'm talking about, Joe Walsh
Back in the 90's I was with a GF at one of those silver stores in the mall and they polished up her silver broach with one of those cloths, and a light went on and I bought one.
I still carry that cloth and it makes strings like new! It must be almost 30 years I've had it in my guitar tool bag.