I'd be suspicious of any foreign-made ammo except Canadian. As Murf says, the US and Canada haven't used corrosive primers for decades, but some other countries STILL do (that's why Russian bores were chromed).
A good swoosh of boiling water will remove any corrosive salts. Then clean with your regular method - the hot metal will actually make cleaning easier! In fact, I often use my wife's little portable steamer to clean my guns - whether I've used suspect ammo or not. A five-second shot of steam down the bore leaves it CLEAN!
Gotta write an article about that someday...
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