As stated, the threads are tapered and you can't use a tap or bolt to clean the threads. It will bottom out at some point about 2/3's of the way through the threads.
I clean threads on water heater anode fittings/drain plugs with a steel battery terminal brush (clean of course, not previously used on a battery). Twist it into the threads, pull it out, repeat as needed to get the threads clean, then use teflon tape on the threads of the new anode rod.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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