A soft wash is the only method of cleaning that should be done on both a wooden and vinyl sided home. Soft washing uses a cleaning solution and the power of a concentrated hose to remove all of the dirt, mold and algae with some brush scrubbing in the more stained areas. Some companies use 3200 psi and up to clean homes, but that causes more damage then good. Hard pressure not only does not kill the mold and algae but it actually pushes water behind the vinyl or scars the wood, creating more mold and damage in later years.