often working on a 30-odd yearold car, you undo a bolt and the thread is all full of crap. i always worry about stripping threads out (god knows i've done enough of them), so i like to give them a clean and a spray with inox before putting the bolt back in
cleaning the thread in the body or part isn't usually a problem, you can grind a bit lengthways out of a bolt and wind that in, cleaning all the crap out, or i've even gone to the massive several dollars expense of buying M6, M8 and M10 thread taps, which i just quickly wind in and out and get all the gunk out nicely
bolts are another matter
not really wanting to spend like 20 dollars each on the accompanying M6, M8 and M10 die, i usually hold a razor blade in one hand, and thread the bolt against the blade with the other hand. it gets just about anything out of the threads, from dirt and silicon to rust, but it's tedious, especially if you have alot of dirty bolts to do
what do you guys do to clean bolts? are there any secrets here i'm missing out on?