A warm solution of sulfuric acid dissolves cured epoxy after soaking. For small amounts of epoxy, repeatedly dropping sulfuric acid on the epoxy is a useful technique and doesn't require soaking. ... Heating above the Tg will soften the cured epoxy and allows de-bonding.
And or,
Take a rag and saturate it with paint stripper first. The chemicals used in paint strippers are formulated to not dissolve epoxy resin but rather melt it. Ball up the rag and put it on top of the residue. Hold it in place for a minute, and then quickly use the plastic scraper to work at the leftover adhesive.
hope this works.
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HERE