Thanks all. Was using a crescent wrench but obviously not very well. The plug was quite resistant to being turned. Got a new plug and socket with extension. Next fall hopefully knuckles will not get mangled. Almost healed now.
I have considered replacing the plastic water heater plug with a metal one or valve that I just have to open or close. Still haven't done it, but it is an alternative. So far I have used channel locks to remove or tighten it and am slowly chewing it up, but my knuckles are still intact.
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