I once removed fungus from a A-24/2.8. It was one of the central elements
that was infected. I used a lineup of three baths with acetone,
alcohol+dishwasher detergent and water. That worked well. But in the end I
screwed the whole thing by drying it with lens tissue. I swear it was clean
from the packet, but still it scratched the element. :-((
I really wonder if that element was made of "ordinary" optical glass. I know
calcium fluorite is much softer than glass and that it's used in lenses, so
that's where my suspicion goes.
Jostein
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