At a reasonable hour, Hubs fired up the power washer and it acted happy and behaved itself.
You can see how the soap and water pressure cut through the grime.Left side= CLEAN. Right side= GRIMEY
Finished and super clean.
The soap was from Home Depot. It's bright green and says for Krud Kutter for House and Siding on it. Our power washer had a hose that attached the soap bottle and it squirted right through the power washer. We used a little in a bucket of hot water too and it worked fine by hand.
I bought a soft bristle brush in the cleaning aisle of Home Depot too and Hubs used that along with our old car wash brush on a pole.
Hubs Tips: Keep the power washer wand about 4-6 inches away from the siding and keep it moving with downward pressure. You don't want to lift up under the siding. While pure water worked at getting the dirt off, using the siding soap really made it clean.
The sun dried the house to a sparkling clean shine. Love it.