Me and several others just pour a cup of bleach down a fresh water hose and attach it to the fiver, flip the lever in the convenience center to fill the FW tank, turn on the supply faucet, and fill the tank. With the onboard water pump on ... open the faucets till you smell bleach, then let it sit overnight. Drain and flush the FW tank with fresh water the next day. Flush out the lines with fresh water as well. A bit of baking soda in a slurry will take away the bleach smell. Introduce it into the FW tank the same way you did the bleach.
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