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Hi Steven
I removed fungus from an old orange C8 primary mirror once. The trick is to get to the spores, especially if the fungus/mildew has slightly etched the glass surface.
I covered the mirror with those strong absorbent paper towels, then poured isopropyl over the towels to saturation point. Then made sure to keep the towels moist and in contact with the mirror surface for about 30 minutes. Then removed and gave mirror a wash and dry. It came up well, with only very slight etching marks which has no effect on the image. I also gave the secondary mirror and corrector a quick wipe down with isopropyl, although they looked fine.
I then made up a mild bleach solution and wiped down as best as I could the inside OTA walls and secondary mirror holder for stray spores.
Others might have better or less radical ideas. My fungus/mildew however has not come back and it is 15 years since it was done.
Ted
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