The Downfall of Fungus

I've had quite some success "rescuing" fungus-laden lenses from ebay as well as from local sellers. Some of my notable rescues include a $20 Carl Zeiss 50mm f/1.8 Pancolar (which regularly goes for five times the price I paid) and a $30 SMC Pentax-M 135mm f/3.5 medium telephoto.

My latest rescue is an SMC Pentax-M 200mm f/4 with significant fungus on the front glass. The photo from the ebay auction:



And after some ministrations with a rubber bulb (to get the front ring off) and liquid soap:



Great success! now I can sell off my 200mm f/4 Super-Multi-Coated Takumar (which is optically near-identical, but requires an M42-K converter) to recover my costs.