I would not hesitate to recommend this pressur washer and for £45, its an absolute bargain.
I have had mine about 3 months and used the snow foam attachment with some valet pro snowfoam on my car to great effect.
Re the questions on the attachments, I would not use the concentrated nozzle on any part of the car, as the wider spraying nozzle is enough concentrated pressure for car cleaning, and even when doing that I would not get too close with it.
Personally I rinse mine from distance first of all, then snow foam, leave for 15 minutes, rinse again with pressure washer, wash using 2 bucket method, rinse again, dry, then wax.
Great bit of kit.
Have also "snow foamed" the conservatory too and that did a suprisingly good job too!