If the tank for the plant watering module is functional at some point in the future, then I would suggest a horizontal pressure washer for cleaning cement driveways utilizing the same tank.
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Or just a pressure washer module. Yarbo Pressure washer module - self storage of some water for automated spray boom cleaning of sidewalks/patios also a self winding hose for manual use. Spray boom and hose could also have one of the sidewalk/patio cleaning attachments as well. For manual use, Follow me mode to get to cleaning area and then attach garden hose to maximize cleaning capacity. Also a self contained cleaner storage tank to dispense cleaners automatically when using in auto or manual modes. Auto refill of the water tank would also be ideal for autonomous mode (spray boom mode).
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