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Good Afternoon from Green Bay

Do any of the members have suggestions for cleaning stains off the back side of frosted ad glass. These stains do not appear to be rust but do have a raised feel to them like a mineral deposit.

This glass is from the MS 70 ad glass top which unfortunately is not a commonly reproduced size 3 9/16" x 11 3/4" with chamfered corners. Thanks for your input. Neil