Mayfair repair...

[RogerT]

To clean up the reeds and assuming it's only surface rust and there is no pitting, I use a small flat (watchmakers) screw driver to scrape off any corrosion, supporting the reed with a feeler gauge blade. Do it under a very bright light. I also use a rubber abrasive block (i.e made by. Garriflex or Peco track cleaning block…the model railway line rubber). This combo should clean the reeds without messing up the tuning. I have cleaned thousands of reeds this way. Don't bother with chemicals. Waste of time. I have inspected reeds (i cleaned this way) several years later and they still look clean and corrosion free (assuming the instrument is stored in a dry place and is played regularly).

Edited June 19 by RogerT