I'm no doctor, but there could be all kinds of "nasties" inside
a harmonica that has been previously used (breathed into and
spit into) by someone else. For this reason, I don't believe
that alcohol on the outside will be sufficient. If it were
a plastic-combed harmonica, I would say you should soak it in
a mild solution. However, the Hering Vintage has a wood comb,
and you shouldn't soak a wood-comb harmonica. That pretty much
loaves only the "disassembly" method. It's the best method in
any case. Besides, if you plan to seriously play the harmonica,
you might as well bite the bullet, and get used to taking them
apart, and putting them back together. My 2 cents.
Richard J. Smith, R.A.
Wormleysburg, PA