Pressure Washing Blog

What does the GreenTree pressure washing blog cover?

The pressure washing blog collects longer articles on Oregon homes: how often to clean, what black streaks are, how to deal with roof moss, and how to compare companies. For short guides by service, see the pressure washing guides for Oregon homes.

How to use the blog before you book

Most articles on this blog answer a question homeowners ask before they book an exterior clean. If you are planning a visit, start with the article closest to your problem. Then read the roof cleaning cost article, because it explains what moves a price up or down. After that, call or send the form, and we reply with a written price before any work starts.

These articles come from GreenTree Services, an Oregon exterior cleaning company working across the Willamette Valley since 2022. Because most Oregon rain falls between October and May, the blog follows the same calendar as the work itself.

Roof moss and roof cost

Two blog articles deal with roofs: moss removal and cost. On every GreenTree roof, moss comes off by hand first, then a low-pressure rinse carries the rest away. No pressure washer goes on shingles, since ARMA, the asphalt roofing trade group warns it strips the granules.

On cost, pitch and roof size set the starting figure, while moss depth and shingle age adjust it. Cedar shake is priced on its own, since shakes need slower hand work.

Shaded valleys and north faces usually need the most hand work, because they dry the slowest after rain. When a roof has soft decking or missing shingles, however, a roofer should see it before any cleaning. In that case the cleaning waits until the repair is done.

Black streaks and siding

The black streaks article separates three causes. Specifically, they are roof algae, film on shaded siding and iron stains at deck nails. Each one needs a different fix, so naming the cause comes before choosing a method. Siding, for instance, is washed at low pressure, because a high-pressure jet can drive water behind the panels.

Wash water matters, because Oregon DEQ asks that it soak into the ground, not run to a storm drain. So the crew steers it into planting beds and covers nearby plants before any solution goes on.

Timing and hiring

The frequency article gives each surface its own interval. That is because shade and rain set how fast growth returns. In general, siding suits late spring to early autumn, when walls dry after the rinse. Roofs suit late summer, before winter rain keeps shingles wet. Gutters, on the other hand, are usually cleared in fall, once most leaves are down.

The hiring article covers the quote, the insurance and the method. Ask any company for all three in writing before you book, including us. Then compare the quotes side by side, surface by surface. GreenTree, for example, carries $2M in liability insurance and puts every price in writing first. If your question is not covered yet, call or send the form and ask it.