KARCHER K4 REVIEW The Karcher K4 Pressure Washer is a step up from the smaller, entry-level K2 pressure washer and comes with improvements and new features making it a more serious model and a great option for those who looking for an affordable pressure washer for tackling larger paths, patios and driveways and of course cars and vans. What you will get from this review? What you may not know is that there are two…