White vinegar works just fine in my HE - but you have to leave it soaking for a week or so. I've done this every 2 years for the last 12. Last time I removed the end cap for a look and the bundle was spotless. Much cheaper than Barnacle Buster or any other branded solution and you don't need to flush it out. Just open the sea-cock and start the engine!
It doesn't seem to harm the impeller, which lasts a very long time. I changed it 600 hrs ago and the old one looked like new (after 500 hrs) and is now a spare.
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