Polishing sickness out with tumbler

you may want to try CLR or Lime Away both available from hardware stores. The stain could be calcification from water and either of these products poured in and then rinsed out will probably do the trick....m

Any ideas on what i can use for abrasive and should it be wet or dry? Thanks, Mike>

I worked on getting scum out of a crystal wine decanter by using a product called "glass magic" that is a lot like dishwasher detergent... sometimes hard to find though.

Alternative for just "scrubbing" - try using dried peas or rice.... I've done that in bottles - shaking it by hand with some water and a bit of dishwashing liquid. They won't scratch the glass

- but will "rub" the other stuff.... just fill and SHAKE SHAKE SHAKE! I' ve also used a bit of "lime away" if the stuff was water deposits ... Cheryl of DRAGON BEADS Flameworked beads and glass

I have removed scum from inside otherwise inaccessable bottles, like hummingbird feeders by using gravel sold for aquariums, which seems to be square sided without sharp corners. I add some soap, about half a bottle of water and a table spoon or so of stones and swirl. When done, I pour the stones out into a little plastic bowl with a lid (catsup condiment from fast food place) pour off the extra water and keep on the window ledge for reuse.

i use barkeepers friend to remove hard water deposits. it's actually oxalic acid, but is slightly abrasive if you don't add too much water.

regards, charlie cave creek, az