Now it's time to flush the detergent from the area with a basic rinse. Turn your detergent tank to "Off," and squeeze the trigger to flush the detergent from the gun and hose.
Stand back and begin rinsing from the same section you began applying detergent. Use a high pressure spray pattern and spray from one end to the other.
Cover 2-3 rows of brick at a time, moving slowly to ensure all the detergent and residue is washed away. You may have to repeat this process multiple times or move the spray gun slightly closer for deeply stained areas.
If you find any white powdery residue, otherwise known as efflorescence, when the brick dries, don't worry. This can be easily taken care of with an efflorescence remover.
Unfortunately, this needs to be done by hand, using a brush. Make sure to follow the manufacturer's directions and do NOT use your pressure washer.