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I have this problem in my lab too ! Methanol does the trick for me. With this or any solvent, you put it on a Q tip and rub gently. This has worked for me multiple times.  The Nikon reps have warned me to not leave the solvent on the objective for longer than this as it could damage sealant around the lens.

Happy cleaning,
Grace

On Apr 24, 2024 1:38 PM, Mika Ruonala <[log in to unmask]> wrote:
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Dear all,
I have today encountered a very unnerving phenomena on a Nikon microscope. The system has not been used for over a year and then also only for fixed specimen. During inspection I noticed that. It only the stage has some clear spills that are hard as glass but also two oil immersion objectives have similar hard crystals. For the 60x oil lens there is a run of the material alongside the lense towards the revolver, and the spring of a 40x oil immersion lense seems to be completely stuck, this lense also cannot be removed from the revolver, it’s like glued on the mount.

No live imaging what so ever was done on the system and the user has only used Nikon type F immersion oil. My fear is this is not properly cleaned immersion oil. Has anyone seen something like this before, and if so, how can all be cleaned?