The most common ways to remove flesh from the skeleton avoiding bone degradation as much as possible are maceration (bacterial, enzymatic), or flesh-decomposing bacteria (edit: and beetles). There's not much left for cremation. Mechanically defleshing the bones would be a bit more destructive, still not leave clean bones, and at the very least would be gruesome for the cleanup crew.
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The most common ways to remove flesh from the skeleton avoiding bone degradation as much as possible are maceration (bacterial, enzymatic), or flesh-decomposing bacteria (edit: and beetles). There's not much left for cremation. Mechanically defleshing the bones would be a bit more destructive, still not leave clean bones, and at the very least would be gruesome for the cleanup crew.