Old Vinagaroon

[Scorpio]

I made some Vinagaroon quite while ago (many months, maybe more than a year). It doesn't do anything to 2 different pieces of leather scrap I put in it for about 5 minutes, pulled out and rinsed with clean water.

Does it make sense to "reactivate" this stuff (it's about 3 gallons an I hate wasting it without good reason), or is it better to start new?

And as I'm at it asking stupid questions, how long do I have to wait after putting the steel wool into the vinegar if I start with a new batch?

Thanks in advance for all help!