I drain my tank until I have a gallon or two of water left in it. Then I drive the rig to Wallmart , get 4 of the large peroxide bottles (pint size), dump them in and let them slosh around the tank on the way home.
At home, I run all fixtures both hot and cold so the peroxide can get in to every pipe and the water heater. Let it sit for an hour, then run everything dry, then run clean water through every fixture a time or two.
Even if a little residual peroxide stays in the system, it won't hurt anybody, and it definitely does not stink like bleach.
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