Bus Bars question

Years ago I forgot a copper coin in my pocket and found it later in the washing machine. It was shining bright.
Maybe you want to try the same. Put all the parts into a fabric bag (or a sock, closed with a knot) with the laundry and let the washing soda do the trick.

After reassembly I would seal the contacts by covering them with some contact spray/-oil/-grease.
Some weeks later I would check, that the nuts still are tightened correctly.

SM-G950F ?

 

If you want to get really crazy, go to Lowes or Home Depot and buy a container of Muriatic Acid. Dip the bars in it and they'll be down to bare copper very quickly. Muriatic Acid will leave the copper practically untouched, but will eat away everything else. (MA is typically used to etch concrete prior to painting/coating.

Another thing to keep in mind is the corrosion on the voltage sensing tabs. Those are the tabs you had to move out of the way to get the busbars out of the orange plastic frame. Those wires and the 'crimps' are very fine and very fragile. All it takes is the wrong bend to put a micro crack in the crimped area and you'll end up with totally whacked voltage readings going to the ecu.

You also want to take a careful look at the plug on the end of that wiring harness and the socket in the ecu. They are very frequently corroded.