You are very welcome Mark as an aside fungal growths can be a problem with the old leather cases that older lens used to come in as they are organic and thus far more liable to produce the fungal spores..   There is not a lot we can do once they get inside a lens..And the internal cleaning may work as long as it is not etched onto the glass in any way..  And for general advice for other readers to your thread makes sense to keep gear dry and not sealed in any case that cant breathe or does not have  good air circulation..  

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt