Well, I use Rodinal and HC-110 currently. I used to use the Pyrocat-MC liquid kits from Photographers Formulary. They are labeled, and I don't reuse those containers. It may seem like a waste, but guess what - I have good developing chemistry every time.
The effort in exposing five rolls of 36-exposure film, or even five rolls of 120, is significant. It's a day's worth of work, and completely sucks and blows thinking that each of those rolls probably cost you in the vicinity of six bucks.
I have done what you did in the past, but it was exhausted developer that was the culprit. Rodinal and HC-110 don't really go bad if you use it wisely.
- Thomas