Thanks to Vid for this idea.
I decided to try using hydrochloric acid to remove battery damage and it worked very well.
The product I used was Zep Acidic Toilet Bowl cleaner. Found at Menards for about $4.
***Eye protection and Nitrile gloves was worn and this should be done outside or in a well ventilated area***
To start I knocked off all the fuzzy corrosion I could with a flat head screw driver into a trash can. Didnt dig to deep, but got all the solder mask and chunky corrosion off and the board looked like this. Most of the damage was just on the ground track. Few via and tracks around u11 where damaged. In hindsight, I should have clipped all the components off the corroded area and removed the solder mask better.
Now I applied the acid. I decided to basically follow the direction on the bottle. I just squirted it right onto the corroded areas. A chemical reaction begins to happen immediately. I am not sure what kind of gasses where created, but they where nasty smelling. Do this outside or with some kind of vent fan. I could hear foam bubbles popping.
I waited the five minutes and came back. No more fizzing. I could see a very noticable change in the board already.
I did the back side of the board next. Another five minutes.
Next up the instructions on the bottle said to scrub. I used an old beat up wire brush I didnt care about. Added a bit of water and made a soap like suds. I could see the suds rapidly turned black with little effort scrubbing.
Washed the board with soap and water. Then used naptha to cut the water so it would dry fast. I was left with a very nice starting point
The board took solder well and gave me no trouble when reworking it. I still replaced all the parts in the corroded area. I also coated most of the exposed copper with new solder. Some of the big areas I sealed in with clear nail polish. Works perfectly now.
The biggest takeaway i got from this is you really need to use a strong acid for corrosion. Vinegar's PH is not low enough to be effective with dealing with the very high PH of battery puke.