BD, For the Vinegar Soak... Is it any Specific Vinegar, (apple or Grape etc white or Balsamic)
I'm not sure if other vinegar types can be used or not, but everything I researched called for good old fashioned white distilled cooking vinegar you find at the grocery store for $2 a gallon, so that's what I used. Heinz makes a "cleaning" vinegar for $3.50/gallon that has 1% higher acidity level. While 1% might not seem like a lot, it actually makes the vinegar solution 20% stronger. I might give it a try the next time around to see if it makes any difference.
I take it you would need to remove all old Paint before Soaking it? Would it have any effect on helping soften and Remove any (Very) old Paint?
From what I saw, the vinegar had no effect on paint. There were a few deep scratches in the axe head where I didn't remove the paint with the wire brush. I thought the vinegar might soften it up so I left it, but I ended up having to use a pick to scrape it out because it was still there after the soak.
Side note - as I was wire brushing the paint off in preparation for the vinegar bath, I noticed these scratches were filled with paint, which leads me to believe that the head had probably been repainted at some point in its life. I no longer felt bad about removing the paint because it was not original.
Whereas I reckon I have a 5lt Vinegar in shop already (its White Apple Vinegar) so I could Start pre-soaking while I build the Electro-Tank, If even still Necessary...
You want to keep an eye on your parts because I read that if you leave them in there too long, it can turn them black. I was checking the parts twice a day to make sure I wasn't overdoing it.
Whatever you do for the soak, make sure it covers the part completely. I saw a guy had partially filled a container and only covered half the part on purpose to show the "half treated, half un-treated" side by side comparison. It created a distinct line down the middle of the part. Anything you leave exposed won't be affected by the vinegar. Also, don't mix it with water because it will just dilute the solution and take longer to work.
Does the Baking Soda Soak afterwards also Neutralise the Vinegar smell? Not one of my favourite things in the world and wouldn't want it stinking up the shop in days afterwards...
The vinegar smell did not stick around once I washed the parts. The process I used was as follows: soak in vinegar for 48 hours, rinse with plain water while brushing away the rust, soak in baking soda solution for 15 minutes, rinse with plain water again, dry completely. You'll then either want to coat the part with oil, or paint, or whatever to prevent flash rust.
I know I'm in the minority, but I don't mind the smell of vinegar at all because, all my life, vinegar has been used for cleaning so my brain associates the smell of vinegar as the smell of "fresh and clean". On a somewhat related but completely impertinent note, I can't stand the smell of Lysol spray because, every time I was sick, my Mom would spray it around the house constantly to "kill germs". To this day, whenever I smell any variation of Lysol, I get a sick feeling in my stomach.
Apologies if these seem like silly questions, I'm sure I could Google all this info but its nice to hear from those who have actually done it.
No apologies needed, I'm happy to help!