You're going to take a couple of steps to make sure that this is done properly. First and foremost, you're going to drain the water out the old-fashioned way by running the machine and spraying it out. Once you're done with this, you're going to turn to a pump saver - a clever antifreeze device that's going to help you to make sure that you get all of the water out of the areas that do not naturally drain. If you can do that, you won't have to worry about water in your pressure washer in the winter.