Hello,
I am positive that copper is not what you want for that....
I believe that stainless steel is the way to go, I believe I have seen thread about a particular kind to use that is "safest"
maybe do a search on brillo or steel wool
And why do you look at the speck in your brother's eye, but do not percieve the plank in your own eye? Or how can you say to your brother, "brother let me remove the speck from your eye", when you yourself do not see the plank that is in your own eye?-Yeshua ben Yoseph