high voltage corrosion damaged PCB ultrasonic cleaning solvent?

[coppercone2]

I have a 120V HV battery which has been damaged by water (drip from upstairs cleaning).

I thought the charger got damaged, replaced the charger, then found out that the battery is taken apart easily with four screws. The PCBs are not conformally coated... anyway I think what happened is the water got under there and shorted some stuff out and electrolysis corroded the copper into the greenish oxide.

It was not charging at all, but I gave it a good cleaning by scrubbing vigorously with a nylon brush while spraying it with contact cleaner.

It charges about 1/2 way now. Some of the components might be damaged, but anyway It seems the more I clean it, the further it charges. I was thinking of desoldering the PCBs and cleaning them in a ultrasonic.. but what cleaning agent is good for this kind of cleanup?

Can I ultrasonic it in vinegar? It does look suspiciously clean at this point though.

[coppercone2]

and, any idea what

vfy326 ic is? I know its a charge protection chip, but where can I buy a few? The one I have is missing a leg now that I look very closely. 

[PKTKS]

In your region (US) it is easy to find a proper solution

Search for BRANSON chemicals solutions for ultrasonic bath

Paul