Back 20+ years ago, a 50/50 solution of water and vinegar seemed to be regularly recommended in some of the build articles in popular magazines I was reading at the time (such as Radio Controlled Modeler and Model Aviation). I tried it, and it worked fine.
Once I was feeling lazy and didn't want to have to run into the house to get vinegar; so I used water only. I did not notice any significant difference; so really do not know what benefit the vinegar is supposed to add -- especially beings the authors of the articles I read recommending it, never offered specifics.