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Truthfully, I don't know if ANY of them are safe for the turbine blades (regardless of what they claim) IF enough carbon deposit material is loosened from the valves/combustion chambers and thrown at them at high speed (and there was a long thread about just this on bitog).
But, those who do the walnut shell blast cleaning claim that the burnt walnut residue cannot hurt the turbine blades, so maybe it is OK?
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