
My standard protocol for 20-30-50 years old rolls is giving me consistently good results.
It is basically high concentration HC-110 and low temperature:
Keep temperature 58F/15C at all stages
Pre-soak in water for 30~60 min
One more rinse to get rid of anti-halation
HC-110 dil A for 5 min
Agitation: 5 inversions every minute+one more every 30 sec
Stop 2 min
Kodak non-hardening fixer 8~10 min
Water rinse
Hypo solution 2 min
Water 5 inversions
Water 10 inversions
Water 20 inversions
Photoflo 15~30min