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Like a fine artist, you will need to know which colors of your pressure washing palette are best for your particular working surface. The White 45 degree nozzle is the best choice for cleaning wood surfaces. The reason is that the 45 degree fan delivers the pressure over a larger area which is comparatively less damaging to wood surfaces. Also, check this out. The nozzle guys didn't choose their colors arbitrarily. No. They color coded them not only to make it easier for you to identify them, but so you can know how hard they hit a surface. Red = Strong and Dangerous, Yellow = Caution, Green = Ok, White = safest. The black nozzle utilizes the least pressure.