I don't get it - would you would think you can hose out a consumer car like this, with the fabric seats and all that plastic trim? I've hosed out Land Rovers, but they're clearly an off-road vehicle designed for wading.
With that preface, I have recommended an Element to multiple acquaintances on account of (seemingly) being able to hose out the inside!
Whatever the root of this perceived 'capability', the dissemination of it was remarkably effective. If you asked me why I thought this, I would say that my recollection was that the official marketing campaign highlighted it as a feature.