Dawn Ultra Blue and HOT water do the trick for gray tanks here at work. Run the water heater on LP, when it shuts off you know the water is hot. Put the drain plug on the sink and add a healthy amount of Dawn. Fill sink with hot water, pull plug and continue to run hot water. You can turn off the water heater, just leave the hot faucet run until the tank is full. Leave overnight, drain and leave the valve open.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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