It sounds like corrosion/mineral buildup on the anode rod. If you had any antifreeze in your hot water heater, it's probably pretty much eaten up your anode. RV antifreeze is highly corrosive to anode rods...
Probably the easiest thing to do is to turn off the HWH, run a faucet to remove the hot water, turn off the pump (or the city water connection), open the relief valve, remove the anode rod, (have a replacement), add about a cup of bleach to the hot water heater (through the anode rod port), install the new anode rod, fill the hot water heater (do not open the relief valve as you need the air pocket), let the HWH sit for at least 6 hours, then flush until the bleach smell is gone, restart the HWH and see if that solves your odor problem. It should.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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