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The window cleaning things you see window cleaners using have distilled water in them. That's how they get away without wiping them afterwards.
Not sure about forum approved but the big Karcher ones all have a problem with the little plastic connectors for the lance and you need to keep a load of them and fiddle with them every time they get stuck. On the power and accessory front they are great though.
What is the forum approved jet washer? Looking for something to clean my wooden decking and also muddy bikes.
Also, do any of them have window cleaning attachments or is that not a thing?