How do I remove dried glue from 2 pieces of acrylic?

Shikai Zuiko
by Shikai Zuiko

I don't know what type of glue was used. There's a circle of dried glue-just arounf the edge-left when 2 plates of acrylic were taken apart-1/4" wide at its widest & slightly raised. Any ideas welcome. Thank you. Shikai

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