water & vinegar mixture for cleaning

[The Guy]

I want to fill my used new to me tank and do a circulation soak.
It's a 45 gallon cube tank so how much vinegar should I use with the fill of water for best results? I'm going to put in a couple of powerheads to circulate the mixture, done this before but can't remember the mixture I used but it did a great job and cleaned up the tank like new.