Hey, all. Hope this finds you well. Held up my acoustic beater to a rare morning sunshine in these parts--and Lordy, this thing looks like Keith Richards uses it to clean his Barbados toes! Quite the gunk map 'tween them frets. I guess that's what happens if you don't clean a fretboard for 20+ years, and pick the thing up while cooking dinner, between house chores, etc., without even thinking of washing your hands first. So what's the best approach, tools, wood-'n-fret-respecting de-gunkifier, etc.? Thanks.