I have a brick of Remington Target .22s that the bullets have oxidation on them. I've had them for a decade, but they've just been either in the safe or the closet. As they are, they won't chamber, but with a little brushing, they will work. A stiff old toothbrush will do the job. I have a Colt Peacemaker that I can remove the cylinder, just drop the brushed shell in to see if the job it done. What a pain. Has anyone else had this problem? Any other remedies?