Ok, I used it on two guitars clearly filthy because of years of carelessness...
I was wondering if it would work and... I totally love the result
I also used other products Dunlop 65 (+ new strings) and my guitars are as new ones
To me it's a great product, I'll recommand it
I had no problem of sticky feeling on the fretboard (I saw that on comments, don't use the condtioner too much and use the cloth to remove the excess oil at the end)
5 stars for cleaning efficiency
4 stars for protection (it's the first day I used it, don't know for a longer period)
5 stars total because it's a good purchase to take care of your instruments anyway
Well thanks for reading