It’s Alive! The Truth Behind the Green and Black Stains on Your Siding

If you live in Hermantown, you don’t even have to look hard to find it. Whether it’s on a vinyl-sided rambler near Hermantown Schools or a multi-story home in Hawk Ridge, those ugly green and black streaks are practically a local landmark.

But here is the truth: That isn't just "dirt" or "dust." It is a living organism.

The Science of the "Green" and the "Black"

The Green (Algae): This is usually Gloeocapsa magma. It loves the moisture and shade found on the north-facing walls of Hermantown homes.

The Black (Mold & Mildew): If you see black specks or streaks, you’re likely looking at mold or mildew. These fungi feed on the organic "biofilm" (dust, pollen, and spider webs) that accumulates on your siding.

Why "Blasting" It is a Temporary Fix

The biggest mistake we see homeowners make is grabbing a high-pressure wand and "blasting" the green off. It might look clean for a few weeks, but it will come back faster and thicker than before.

Why? Because pressure only removes the surface "head" of the organism. It doesn't kill the root system. Even worse, high pressure can force water behind your siding, leading to rot and interior mold issues.

The "Up North" Soft Wash Solution

We don't use pressure; we use chemistry. Our specialized soft wash system is designed for the Hermantown climate:

Complete Eradication: We apply eco-friendly cleaners that kill the algae and mold at the root.

Surface Safety: Because we use low pressure (no more than a garden hose), there is zero risk of "wand marks" or siding damage.

Neighbor-Approved Trust: We are fully insured, 5-star rated, and have 13 reviews from your neighbors who already made the switch to soft washing.

The 2-Year "Green-Free" Guarantee

We are so confident in our process that every house wash in Hermantown comes with our signature 2-year guarantee. If you see that green or black growth return within 24 months, we come back and make it right—on our dime.