I dropped 60 used Federal brass cartridges into my sonic cleaner with Hornaday sonic cleaner solution and cycled it a couple of times (usually 4-5 times does a nice job) then got distracted. I came back a week later and the brass looks patchy and has lost it's shine in places. A couple more cycles and no change. It appeared dull and as if its lost some of its "yellowness" if that makes sense. Is this still usable or should I just bin it?