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I use oil, soaked into the tape with a small brush for a day or two, then gently scrape with a wooden popsicle stick or wider tongue depressor (WallyWorld - $3/pack).
The sides of the popsicle stick can be used as is; but I much prefer cutting both ends off with a razor blade, leaving a chisel edge at a 45-degree angle (It can be done with a single cut, via holding the single-edge blade at the proper compound angle).
Alternatively, the stick can be simply cut into a chisel edge 90-degrees to the length of the stick.
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