Filthy Brass

[Catfish]

If it`s clean and just ugly it will work fine. The are different polishes on the market that will take the corission off, but it will take several hours if they are like some I`ve seen, and being cheap like you, salvaged. I would be sand would be to aggressive and do alot of damage to your tumbler, especially if it`s a vibrator type, rolling type alot less damage as you can tumble rocks in them.