I'm adding this only because I've never seen cider vinegar here. (then again, I've never looked for it, so I may just have missed it.) White vinegar works too, and a minute is as long as you need. They must be rinsed thoroughly as mentioned by Cee-Zed. They won't shine like they're going to church, but they'll be damn clean. I cleaned a batch of .308 that'd been store outdoors for a year; soaking for an hour did no more than the first 40 seconds.
After the rinse, I stick 'em in the oven for about an hour at 200 degrees or less.
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