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Vario lance should be the one and using it at the highest setting will be fine unless you have bought a mega potent Karcher. Not sure what the high pressure lance looks like but would reckon its fine too, dirt buster will be too concentrated a blast. Anything that gives a "spray" of water onto the car will be fine.
Get yourself a proper snow foam lance, connect that first of all to the Karcher, cover with foam, dwell for 5 mins and then blast away, that will remove 90% of the dirt and the nasty stuff that will scratch your car while hand washing.
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