Easy job. Dewinterize just means flushing the antifreeze out of the piping. I also test all of the propane fired appliances to make sure everything is OK for each upcoming trip.
To sanitize use 1.4 cup of regular household bleach for each 15 gallons in your fresh water tank plus the volume of the water heater. If you don't have a gravity fill for the fresh water, just pour the bleach into the hose before hooking up to the water source. Fill the water tank and then use the on board pump to fill the water heater and transfer the dilute bleach solution to each faucet, shower head, toilet, etc. Let sit for 4 hours, then drain the water tank and water heater, refill both with fresh water and pump through the system again to clear the bleach solution.
2003 Winnebago Minnie 24F - Ford E-450🙂