I USE THIS POLISH, THIS WAY....
I'm a sitar player, an instrument from India with 20 frets, usually nickel plated brass. Unlike a guitar, these frets really need to be cleaned to enhance the way we play, and care must be taken not to use other liquid cleaners, as it can drip or splash onto sensitive fret tying string or on the very expensive wood finishes. I'm not going to sit and tell you the entire procedure, suffice to say it is tedious and all the strings ( 7) need to come off. If I tried to do this with say, brasso or some other liquid, I'd be sure to blop.
Met-All on a cotton ball or similar cotton swab, is ideal. Just a small/scant amount, is all that is necessary to do the job. People who have used other, similar chemicals, already have it in their mind that this stuff is going to go all over, but it stays exactly where you put it, because it's more like pudding, not at all like a lotion like brasso. It takes a tiny bit of elbow grease, but the results are spectacular. Once it's polished, it stays that way longer than the other stuff on the market. I love the idea that it's not abrasive nor toxic.
ProsIt's superior, it's easy to use and easy to store.
ConsI'll be dead before I can use it all!