I did the same thing to a travel trailer a few months ago, and in the spring we will find our how well it worked! But, I am pretty confident.Originally Posted by rick.a
Drain the water heater, then blow out the lines by opening valves and faucets one at a time, beginning (and possibly finishing?) with the farthest away. When you are done, open all valves and the WH drain and leave them open. If you are concerned about bugs crawling in, tape a bit of cloth over the openings. But as to air, I suspect you are going to need a lot more than a 10-gallon tankful.
And as to the traps, I use inexpensive windshield-washer fluid.