i removed some brasswork off one set of celluloid scales and i have re-glued it to another set acrylic scales.

while trying to sand them on the new scales the sandpaper sticks to the glue that over ran the brasswork, leaving black smudges on the scales.

Does anyone have any tips for removing these black smudges without unglueing the brass. i have tried acetone on a cloth, but am pretty hesitant in case i melt the scales or unglue what i have just stuck on.

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