Not a pressure washer! Xymol shampoo from Halfords, luke warm water, this after rinsing the car with cold water from a hose pipe. The leather it dry and finishing the windows off with newspaper, as this helps to stop any streaks.But if you insist on apressure washer then you can't go wrong with the trusted Karcher range.
I know but honestly for it's use I don't really need much more. If I were to be cleaning concrete or decking regularly I would probably need something better but for car cleaning and getting in behind the alloys, blasting flys off the bumper it is good for the money.