dewinterize question

Here is what I do for this. I have a outside filter that I fill with about a 1 and half cups of bleach. I then connect city water and set the bypass on the water heater for summer use. I then turn on all faucets till I smell bleach, this includes inside and outside. I let this to set for maybe 4 or 5 hours. I then open up the outside filter and place a cup of baking soda in it and repeat the above items. You can just flush the bleached water out by running water through it but the smell of the bleach makes it very hard for me to stay in the camper so I use baking soda. I do want to point out since we bought this camper in 2008 I have never put any water in the water tank and only use the water pump each fall to winterize but that may change this summer as we will be camping at Shawnee State Park outside of Portsmouth and their sites do not have water only electricity.