Vinyl siding, brick bases and soft wash technique
Vinyl is common in subdivisions of this age, and brick often appears on foundations and chimneys. Neither likes a hard jet. High pressure can force water behind the vinyl and into the wall cavity, where it may stay for a long time. It can also gouge soft brick or scatter sand from the joints.
Soft washing works the other way around. A cleaning solution loosens the growth, then a gentle stream rinses it off. The method is slower than blasting but safer for siding, trim, window seals and light fixtures. After rinsing, we check the corners and the area under eaves, since these hold the most stubborn growth.
