I've got a K5 and love it, very powerful, but majorly overkill.
Don't forget to check out the karcher outlet if you're happy with a damaged box/refurb unit, some good savings to be had occasionally.
My K5 is an "eco" which seems to give it another mode other than on that apparently uses less water. Never noticed much of a different myself tbh, not sure if the K4 would be the same.Snow foam?
put a half inch layer of thick foam on you car and removes dirt and traffic film in about 5-10 mins without the use of a sponge.
just rinse off after the 5-10 mins.
best way to clean a car imo, gets into the places that you can't with a sponge or brush.
Most vastly overhyped car cleaning product on the net, a dirty car will remain a dirty car regardless of how much snow foam you spray at it.
This is what I use with my K3:-Where do I get decent snow foam? And how do I apply it?
Where do I get decent snow foam? And how do I apply it?
Decent snow foam will lift off most winter dirt without having to do much else!

I'd rather not blast the dirt off myself.Yeah but so does a high pressure rinse with a pressure washer.![]()