I would just try to see if I could remove A LOT of old fungus with Hydrogen Peroxide 3% in my old PreAi Nikkor 50mm 1:1.4.
And it turn out to be very good, after that I clean the lens element's surface with lighter fluid, just to take away the rest of residues.


Here are some link's to different repair tool's and lubricating stuff:


"ORBIT" HEPA Blower:

https://photosol.com/products/orbith...

You can buy it here:
https://www.adorama.com/cpkhjdb.html




"LiquiMoly" LM 50 Litho HT:

https://www.amazon.co.uk/LiquiMolyL...



"LiquiMoly" LM47 MoS2 grease with Molybdenum disulfide:

https://products.liquimoly.com/lm47...



or on Amazon:

https://www.amazon.co.uk/LiquiMoly3...




Contact glue:

https://www.loctiteproducts.com/en/pr...




Japan Hobby Tool rubber cone:

https://www.amazon.com/JapanVacuumC...



18 different size rubber repair tool's:

https://www.amazon.com/SizesLensFil...



You can also buy this set.

Lens Repair Set with pointed, flat, half flat tips:


https://www.amazon.com/dp/B00QRPWCN0/...



JIS cross head screw driver's:


https://www.amazon.com/MoodyTools58...


Or this set, that is the set I use:


https://eustore.ifixit.com/en/Tools/D...



Lens cleaning wipes (PECPAD):


https://www.amazon.com/dp/B0161VIZZ8/...



Thin Cotton Buds x 200 you can buy them here:

https://www.muji.eu/pages/online.asp?...



DSLRKIT Pro Lens Vise Tool Repair Filter Ring Ajustment Steel 27mm to 130mm:


https://www.amazon.com/DSLRKITRepair...


Japan Hobby Tool Helical Grease Made in Japan:

https://www.amazon.com/JapanHobbyHe...



Loctite 222 50ml Threadlocker

https://www.amazon.com/HenkelLoctite...