You can easily get a sonicator / ultrasonicator from China for cheap. Do it yourself and use some mineral spirits or acetone for media. No need to pay someone big bucks for high frequency de-sheathing.
Also, I'm well aware about the fuels being varying degrees of quality. As a rule of thumb, I generally try to only fill up at Shell, Texaco/Exxon, or Mobil stations.
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