I take a water bottle (you know like Aquifina or Ice Mountain or whatever available bottled water). Use my pocket knife to cut a hole in the side about 2" across and use that as the "funnel" to put about 1/2 to 1 cup of bleach into the water tank which is already about 1/2 full. Then I proceed to fill it more (to something like 3/4). It does get a little messy so be careful not to bleach your clothes.
Then pump the water throughout the coach until you smell bleach at each faucet. Let that sit while I drain the water tank (takes some time).
Refill the water tank and flush out the bleach water after a few hours.
Recycle the cut water bottle.
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