Is it possible to clean the black mould off of reeds ,or are they no longer any good(breathing in microscopic spores etc).I have only had this problem since I started storing my reeds in a TTS tin,never when using manufactures reed guards as supplied.
I'm no expert but if you are concerned and don't want to bin and buy new, a scraping with something like a razor blade and a soak in some white(clear) vinegar for a couple of minutes should do the trick.
I would just wash them under the tap and you could wipe them with Listerine or similar. If they are really bad, dump them. I only ever got mold on reeds when I stored the reed holder in a Ziplock bag. This was a tip from a book as well.
So, dump the tin and get a reed holder, or go back to using the holder they come in.
Moulds are more than aesthetically undesirable - I seem to remember that there is a species of mould, which grows on certain nuts, called aspergillus and this can be carcinogenic. You have only to think of the extensive root systems of the edible fungi to realise how the cellular structure of a cane reed can be invaded. I would hesitate to accept that a product such as Listerine would totally eradicate what is within the internal reed structure purely because moulds and fungi differ from bacteria which Listerine and similar products are designed to affect. "If in doubt, chuck it out" might be a wise course to follow!