Dirty Chips

I use a simple pencil eraser on most of them. And for the stubborn ones I use said eraser with either some Flux Remover & Cleaner or some Isopropyl Alcohol.

If that don't get 'em clean, then I toss 'em. :D
 
Asked and answered quite often here :) Fiberglass pencil aka "nick sander" at hardware stores. I paid < $2 for one 5 years ago and stil working.

It doesn't exert anywhere near the pressure a pencil/ink eraser does, and doesn't damage them like sandpaper does. Takes off the oxidation and not much else. Also works GREAT on card edge connectors without fear of lifting them.
 
The fiberglass pencil is hands down the best method. You can find them on ebay and possibly jewlery stores / supply house. Jewlers use them all the time.
If you get one buy a few and/or some refills for it.
 
Another item that works are the brass brushes that look like tooth brushes.

Bill
 
+1 on the fiberglass pencil.

I've also found that Novus 2 works well. Shines them up nice without damaging the passivation. Of course there's cleanup afterward, so I'd rather just use the fiberglass pencil.
 
I've also found that Novus 2 works well. Shines them up nice without damaging the passivation. Of course there's cleanup afterward, so I'd rather just use the fiberglass pencil.

I use Novus 2 on edge connectors all the time, followed by alcohol. Makes 'em look like new.
 
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