Hello. I have a 50mm summicron DR M mount lens. There appears to be some, not quite fungus, but probably blow off from lubricant behind the first or second element. Not disrupting use at the moment. The front lens is ok, the final lens element in the lens cluster is also ok (when I take out the lens cluster). I'd like a recommendation of someone to clean it. I used to have a local tech - rural Oz - but he's gone to glory. Any suggestions greatly appreciated. Regards, Arthur.