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Re: Cleaning glasses.
I don't think there is a useful way to brighten or restore the colors. For cleaning a glass, definitely stay away from dishwasher and use non-scratchy pad, wash in warm, not super hot soapy water. Regular washing will not fade the colors, only hot dishwasher with harsh soap will do that. A dishwasher even without soap will fade a glass due to real hot water. For an older glass with slight dullness on the paint, where the paint is "oxidized" you can sometimes use a regular pencil eraser and that will erase off the top layer of oxidized paint. go careful and try only on a small area to see if this works - it seems to work sometimes on older one color glasses.