I have always used the winterizing hose off the water pump. I take a gallon jug 1/4 cup bleech fill with water, and let the system do the rest. Yes for the fresh water tank you have to go through the fill port. For that I have put filled the fresh water hose up with bleech then attached to water faucet filled fresh tank to about 1/3. This way the hose and tank are sanitized.
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Retired and never looked back
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