Remove as much of the moss as possible from the affected area. Use a stiff broom or long-handled brush to scrape the moss off the surface. Use a pressure washer on a surface such as a driveway, brick walkway and lawn furniture cushions, where the pressure washer's water stream will not cause damage.
Pick up scraped-off moss while wearing gloves, and place that moss in a bucket or wheelbarrow. The removed moss can be transplanted to a more desirable area or put in the trash.
Mix oil soap in a bucket with hot water by following the oil soap manufacturer's label directions, or use 1/4 cup of oil soap with every 1 gallon of hot water.
Apply the oil soap and hot water mixture to the area from which you removed moss. Scrub the surface with a scrub brush or rag, removing the remainder of the moss along with debris that accumulated beneath it.
Rinse the area with clean water, and allow it to dry thoroughly. Scrub the dry surface with a second application of the oil soap and hot water mixture if moss or debris remains on it.