I would use the Karcher but my patio is paviours and over the years some have moved, so the pressure washer drags up the sand and dirt between them, leaving a muddy mess. I use Wet and Forget once a year to get rid of the algae but it doesn't get rid of any stains. On the path between our houses where it gets very green because of the shade I just sprinkle soda crystals (much cheaper and quicker).
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