Result:
Maybe. Ok, I did it today, 1 qt pure B100. Ran 30 seconds, and all sorts of ugly fuel infested the jar. Ran it for a bit, then put another quart of Bd with a healthy dose of Kleen added. Let it run the jar down.
It did make a difference. Maybe not the greatest difference in the world, but it did help a little. When it was done, the engine idled without a shake, smoke almost non-existent.
I"m satisfied that I can wait till my next order before getting some purge.
Your results may vary.