Green streaks on the shaded wall, and why a hard blast makes it worse
Mildew and algae settle on the north and shaded sides of a house first. On vinyl they show up as green and grey streaks under the eaves and along the base of the wall. On cedar shingle they darken the grain and hold moisture against the wood, which is how a clean-looking shingle wall turns soft and black in a few damp seasons.
High pressure is the wrong answer for both. Cedar splinters under a hard jet and the fibres lift, so the wall comes up fuzzy and soaks up the next round of growth faster. Vinyl can warp, and a forceful stream pushed upward drives water behind the laps where it sits against the sheathing. That is the damage a homeowner never sees until a seam goes soft.
Roofs, downspouts and gutters fail the same quiet way. Black streaking on shingles, a gutter lined with silt and a downspout that spits water at the foundation are all surface problems that turn into rot or a leak if they are left alone.
Detergent does the work and the water only carries it off
Soft washing is the lower-intensity technique, 300psi or less, built around the cleaning solution rather than the force of the water. The solution is applied, given time to break down the mildew and algae at the root, and then rinsed away gently. Nothing is blasted, so nothing splinters, warps or gets forced behind the cladding. The crew pre-treats with environmentally friendly cleaning products, the same approach used across every surface.
The residential list reads Soft Washing for Vinyl Siding Cleaning, Cedar Siding Cleaning, and the roof side of the job sits right beside it: Roof Cleaning, Downspout Cleaning, and Gutter cleaning. Gutters are cleared and rinsed, downspouts are flushed so they run clear, and roof surfaces are treated at the same low pressure rather than scrubbed or blasted.
The same method is used on glass and wood that would otherwise splinter, warp or break. On homes in Westchester, on Long Island, and on the narrow lots of the boroughs, the setup is the same: protect the plantings, apply, wait, rinse.
Keeping the growth from coming straight back
Soft washing removes contaminants and helps prevent mold and mildew from developing again as quickly. Because the treatment reaches the growth itself instead of only rinsing the surface, a soft-washed wall tends to stay clean longer than one that was only hit with water.
How fast it returns depends on the house. A wall under trees or facing a damp yard will green up sooner than a sunny one. Watch for the first faint green at the corners and along the bottom course of siding, a darkening in the cedar grain, or gutters that overflow in light rain. Those are the signs it is due again.
To talk through a house, send the address and a photo of the worst wall through the contact page, or call (917) 671-9500. Quotes are free, and the crew works homes across Long Island, Westchester and all five boroughs.
