I picked up my harp yesterday and several reeds were stuck. I don't play it much, but I've had it for about 10 years, and that's the first time it has given trouble.
I stripped it down, -not a job for the short-sighted,- and found that the trouble was some kind of black deposit (light corrosion?) patches on the twin reed pans.
soap-and-water and scrubbing didn't shift it, and I resorted to scraping, which fixed the problem, but I'd like to prevent recurrence.

So, what do you do?
It's a cheapie but a goodie, and it won't take many more services like that one. The minute brass screw-heads are suffering already. Chris.