[Mariner (Frank)]

Hi All,
I was wondering if mould on the inside of the meniscus lense/corrector plate of a MakCas is a death sentance for the scope? Is there no comeback short of a new lense without compromising optical integrety? Can they be cleaned or restored or recoated? How does an MCT get mould in it anyway?

There is an ETX on ebay for sale with some mould in it should i steer clear of buying such a scope in the first place?

Thanks, F.