Years ago when the only harmonica worth while for playing
blues was the venerable Hohner Marine Band. It sounded great
but leaked air around the wood comb which made them play inconsistantly.
There were some musicians that would soak their harps
in a glass of water and there are even some stories
of soaking them in whiskey! I’m sure most of us have
heard of this at one time or another.
These musicians would soak their harps to get better tone.
While this is true, what was actually happening is that the
moisture from the liquid would cause the wood comb to swell
up sealing any gaps along the reed plates thus
producing less air leakage and a fuller tone and greater volume
from their harp. The water did just fine and as far as the
whiskey goes, it probably did more harm than good by gumming up the
reeds and inducing corrosion on the reedplates.
Today we don’t need to do this and I don’t advise soaking
your harp, wood or otherwise in any liquid. I know there
are some that even soak their plastic comb harps! This really
won’t do anything except make them corrode and wear out quicker.
Modern harmonicas including the Marine Band are much better constructed
and the new Marine Band Deluxe and Crossover harps have sealed
combs so the wood expansion is no longer an issue.
Keep your harps clean and tap them on your leg or hand
when finished playing to get the moisture out and you’ll
have your harmonica for a long time.