Tin is slow to tarnish. Which is why it is a great material for reflective ornaments like our Victorian Tinsel. It will be years before your piece has noticeably lost its luster. Tarnishing can be slowed down be storing your item in an airtight bag. If you want to polish use a non abrasive metal cleaner. Read the directions carefully. A lot of elbow grease may be required to use the cleaner. Our favorite is Nevr-Dull™. We do not advise the rough side of any punched item be polished.