I am considering buying a vintage (c. 1990) Tiffany watch with an 18k gold case and leather band. Some of the models on eBay and Chrono 24 have a bit of tarnish around the edges, and they are much cheaper than pristine versions. I am wondering if it's possible or advisable to clean this tarnish? I have read a bunch of articles that recommend toothpaste, baking soda, other concoctions, or advise doing nothing, lest you damage the watch or the engraving. I generally don't want to get pristine versions of vintage items anyway, since I will not feel bad if I scratch it myself while wearing it. But I am interested in advice on cleaning visible tarnish, or if I should expect that I would not/should not change the appearance or condition of the more used-looking examples. Thanks!