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I thought I saw this somewhere else, but cannot recall where. As most of you know, the part number labels are not easy to remove. Most people use various solvents including paint thinner, acetone or naptha. In the summer this works fine, but with my shop below 50 degrees F, my solvent, paint thinner, does not seem to cut through all the glue. I found the easiest way to deal with this is to sharpen a stick, such as a paint stirrer or similar shaped wood to a wide chisel point. I soak the label in solvent, then scrape it off with the sharp stick. Wood (or a fingernail) is just the right hardness so that it will scrape off the label without scratching the aluminum. In the summer I had used a plastic paint scraper, but this time of year, the wood is better.