Pentacon 135mm f2.8 - Fight THE FUNGUS!

Pentacon 135mm f2.8 M42 - The Lens Cleaning. By a non-professional, obviously - though this uneducated try was definitely an improvement! I love this lens.
ADVICE: Avoid woolen gloves (because of the dust).
AND: Don't get eaten by THE FUNGUS!

[@CableWrestler]

Dont use toilet paper.
It leaves so much dust inside the lens.
Use a microfibre cloth thays damp.
Use alcohol wipes.
Use a clean rag with some RainX even!
I learnt the hard way not to use toilet paper.
Your lens is so full of dust at the end.

[@zettelberg4276]

You're right, of course. But that's how learning goes - at least I got an improvement. Next time it'll be perfect! ;-)