Exposure to sun, pollution, and the elements can turn siding chalky, faded, and porous, allowing dirt and mildew to penetrate the surface. I would try pressure washing, first with straight water on low pressure. If that's not getting the job done, do a test wash at high pressure in a place that's not highly visible. Some pressure washers develop pressure great enough to break a 2x4, and the last thing you want is to damage siding with high pressure. Then try scrubbing it with a biodegradable detergent or trisodium phosphate and hosing down with a low-pressure spray.
Written by Steve Thomas http://www.thisoldhouse.com/toh/asktoh/question/0,,216407,00.html
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