Voitländer Nokton 35mm f1.4 M mount front element removal

Hello, I have a Voitländer Nokton 35mm M mount lens that has residue on the back of the front element from moisture. I've tried disassembling it to clean and I can't seem to remove the front element. The retaining ring spins but won't unthread. I've tried completely disassembling the lens from the back but I'm unable to access the front element that way and can't find any information online. Is there any information available on how to do so? thanks!

If the ring spins but doesn't unscrew it may be glued in of a press/snap in decorator. Take a very close look
around the rim for a notch but some of them have nothing and have to be pried out. A sewing needle can be your friend.

FWIW if it's a pop out there should be three screws that are behind the ring.