For those worried about fungus in a lens.

Cleaning the glass surfaces is always going to be easy - reassembling the lens, correctly collemating the assembly, is going to be much harder.
 
Legacy glass is fairly easy to take apart for cleaning, as well as reassembling. Modern lenses, chock-full of electronics, not to easy.
 
Hmm, that is very mild minimal fungus ... I've had stuff that covered an entire face of an element, and had been established long enough that it etched itself in the coating.
 

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