Ok one thing at a time.
I see where you going with the food loin DI water wouldn’t do anything except make salt water I really should have thought that out . I have some silver nitrate crystals how about using that?
I thought I had read that you used weak sulfuric acid to clean up your silver , so I tried that with dirty silver from a copper cell.
The 05060 jpeg file is a picture of rinse water that I tested using HCl I usually go through a gallon water if not more rinsing / cleaning up the silver