From my 6th grade science: find your friend who has the longest hair and ask for a strand or two. Find a board about 12" long and pound a nail about half way into it at one end. Tie one end of the hair to this nail, and tie a small fishing sinker to the other end. Now, in the center of the...
I have been a wood worker longer than I've been a guitarist. If the stuff doesn't come off with a damp cloth, don't go with more water and detergent. There may be paths where the frets are inserted into the neck that water could get in. And usually, what people describe as "gunk" will usually...