Usually "loctite"or threadlocker is a liquid you apply right before installation. I've never seen it pre-applied on a piece of hardware so I would guess anti-seize or maybe just paint to protect the threads from rust. You now have the perfect excuse to get the metric tap-and-die set you've always wanted. A die will will clean the threads up very easily but I might try a wire brush first to see if the junk will come off without that much effort.
A shade-tree cheap-trick would be to buy a nut that is threaded for the bolt size and pitch. Put it in a vise and then crank your bolt through it. If that is not enough cleaning action you can cut a slot in one half of the the nut, compress it a bit with the vise and then run it through again.
A shade-tree cheap-trick would be to buy a nut that is threaded for the bolt size and pitch. Put it in a vise and then crank your bolt through it. If that is not enough cleaning action you can cut a slot in one half of the the nut, compress it a bit with the vise and then run it through again.
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