MusicNomad Fretboard Care Kit MN144

I used this on seeveral guitars, some of them who had quite rusty frets and really filthy fretboards. The fret polish works like magic. Just put the guard in place and rub the fret with a little bit of the product and you'll get rid of all the gunk and rust to reveal shining frets.
The oil for the fretboard is even more easy to apply and can even be used on unfinished maple without discoloration. Just buff on and buff off. If your fretboard is really filthy, you will have to rub a bit harder. Eventually, the whole fretboard is as good as new with just this set. i really recommend this.