Hello.
At this point I do not have in project to put online methodology for lens dismounting. (and I need to keep some secrets for my business to live ! 😉)
But with logic, patience, you will be able to do it as I did with good mechanical knowledge. NEVER FORCE ANYTHING !
Some typical haze can be caused by different things :it can be because of old lubricants that has left residues in evaporating, but it can be coating itself that has changed in an hazy and hardened material...😱
Problem with lens cleaning is that sometimes it removes the coating. Be aware of that ! Never try to use solvants. Always use lens cleaner or pure ethylic alcohol. Always use a soft cloth for inner surface coating as coating is softer here.
Some early coatings (war and immediat post war) can easily be removed even with lens cleaner (Early coated Kodak Ektar for exemple about 1942-45)
Peter, Canon RF lens has 2 main type of focusing mechanism. The one for wide angle and normal lenses, and the one for the tele. But there is not one method. Sometimes nothing goes right, and all is tightened so hard and filled with corrosion...🙁
For the SK in particular, he lens had to be heated to dismount the front lens element, then beaten with of piece of soft wood on the external side for I was able to unscrew it.
Tools needed are spanners, good screwdrivers, and some that you have to make yourself (or order by a skilled adjuster) to match the original factory tools.