I cleaned all my ashtrays to their original sparkly and clear luster. I've placed them all around my house, and now instead of filling them up quickly and mucking up their centers, they have become beautiful resting places for my e-cig as I go about my business throughout my house. I never realized how much it bothered me to have an amazing vintage ashtray slowly become disgusting by the tar and soot glued to it. It's nice to have a shred of cleanliness around my house now.