if you have rust inside the rails, cleaning with a spiral brush as John mentioned is the best way. problem is you need to do a very thorough job and then put some kind of coating so it wont rust again after you put it together, which will cause all kinds of headaches and I have seen a rail connection get so hot that I branded my hand because of a poor connection.. to me if the inside is corroded it is not worth the time or effort.
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