Looking at getting a pressure washer, mainly for the cars/bikes. Not sure of the spec. to get. I see from a search here and elsewhere on the old interweb that Karcher are a good make. And they can be picked up fairly cheaply. But what sort of pressure is needed etc, as this determines, partly, how expensive the model is. It'll need to clean all the crud from under wheel arches/floor pans as well as just the bodywork. And I use a lot of narrow, farm-crud laden roads here in Cornwall ... I'll also want to use it to clean walls etc of moss/algae I presume. Not interested in cleaning block paving!

So, what sort of pressure? How about hose length to watch out for? Attachments (though I've seen the threads on the hi-foam wotsits so not needed at first) needed? General things to watch out for as I've never bought one before and I'd rather get some idea before I buy ...

Ta in advance.

Dave