As a retrofuture thing pointed out by Reddit, a 1950's production depicts a house where all surfaces are waterproofed, thereby allowing easy cleaning with a hose. This would be easy, fun, and hopefully would have good drainage.
Existing houses are sensitive to water damage. Wet carpet tends to develop mold spores, wet wood tends to rot. Water encourages vermin, fungus, and bacteria, none of which is great for your health. Mold tends to further damage infected surfaces.
And as easy as a jet of water is, to really clean one would have to provide some sort of soap or detergent, and then rinse it away. That would easily double the complexity of such a system.
...waaaaaiiiiitttt a minute.....