Try some Ponds Cold Cream. Put a healthy amount on some lens tissue and - gently - smear it on the lens. Let it sit for a few minutes and then carefully wipe it off. Follow that with a "normal" cleaning with lens cleaner and tissue. That usually takes 99% of fungus off a lens, and if it will take that off, it'll take off just about anything. BTW - I've done this and NOT damaged coatings...