Silo 30 maple fretboard horrible stains – what reason and what solution?

Silo 30 maple fretboard horrible stains – what reason and what solution?

I am considering some offer of Sterling Silo30 and apart from still open question (is it 30 or 30D – to be yet defined) I will appreciate advice/experience with maple fretboard stains. Just received pictures which have really frightened me.
Will it mean sanding … like 1mm deep to get clean maple and then refinish with poly?
Or maybe it is just dirt around frets getting only shallow into the wood surface? Last frets’ section look worse but this is not the most dirt/moisture exposed part of…

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