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...