You can use a pressure washer for this job but keep the pressure low and the nozzle away from the siding to avoid eroding the wood and driving water into cracks and crevices.
Repaint house siding.
Wood vinyl stucco and more.
Scrape any loose paint from the siding.
Create your solution and clean the siding.
Assuming that you properly cleaned the siding prior to painting you can expect the.
Rinse the siding with your high pressure nozzle and water hose to reveal a splotchy surface with exposed wood in areas where the coatings have broken down and paint with good integrity still clinging to some surfaces.
The goal is a smooth surface with no peeling paint or sharp ridges of coating.
Update your home with new exterior siding paint.
Scrubbing with a sponge using a pressure washer or a random orbit sander.
There are three ways to clean the siding.
Wear gloves then mix in a bucket a cleaning solution of one cup chlorine bleach one cup tsp and one gallon of water.
If the condition of your wood siding is good it may only need to be cleaned prior to painting.
The silver lining is this.
Washing alone is often not enough to remove mold or mildew from the surface.
Make sure to wear a dust mask to keep from breathing the paint dust.
Just like wood decks and fences the exterior wood siding on your home should be properly maintained to protect the wood from the elements and keep your house looking great.