Roof Cleaning & Black Streak Removal in West Michigan

Short answer: Those black streaks on your Hudsonville roof are algae (Gloeocapsa magma), not dirt. The only safe fix is a soft wash — the method ARMA actually recommends. Pressure washing strips granules and shortens shingle life by years.

If you've driven through any West Michigan neighborhood in the last decade you've seen them — the black streaks running down the shaded side of asphalt roofs. It's not dirt, soot or storm debris. It's a living bacterial colony, and it's slowly eating the limestone filler out of your shingles.

What's actually growing on your roof

Gloeocapsa magma is a cyanobacteria that thrives in humid climates with cool shaded surfaces — exactly West Michigan's spring and fall. It feeds on the limestone aggregate embedded in asphalt shingles, which is why the staining gets worse year over year, not better. Lichen and moss often follow once the surface is established.

Why pressure washing destroys an asphalt roof

Dislodges granules. Those granules are the UV shield. Lose them and shingle life drops by years.
Drives water under shingles. Upward-angled pressure breaks the sealing strip.
Voids most shingle warranties. Manufacturers specifically exclude high-pressure cleaning.

What a proper soft wash roof cleaning looks like

Protect landscaping with pre-wet and tarping.
Apply a sodium-hypochlorite based cleaning solution at low pressure (under 100 PSI).
Let the solution dwell — kills the bacteria on contact.
Low-pressure rinse and a final landscape flush.

Most streaks lift fully within 24–48 hours of treatment. The roof looks visibly cleaner the same day and continues to brighten as the dead colony washes off in the next few rains.

How long the results last

A correct soft wash typically holds for 4–6 years in the Hudsonville area before regrowth becomes visible. Adding zinc or copper strips at the ridge extends that further — every time it rains, trace metal ions wash down the slope and inhibit regrowth.

2026 pricing in the Hudsonville area

Ranch / single-story asphalt roof: $450–$650
Two-story standard pitch: $650–$900
Steep or complex roofline: $900–$1,400
Add: zinc/copper strip install: $3–$5 per linear foot of ridge

When to schedule

April through October works best in West Michigan — the cleaner needs dry, above-50°F conditions to dwell properly. Most homeowners bundle roof cleaning with a spring gutter cleaning and a full window cleaning in the same visit — one trip, one bill, one clean exterior.

Want an exact number for your roof? Request a free quote and we'll measure off satellite plus an on-site walk before pricing.

Frequently asked questions

What causes the black streaks on my roof in West Michigan?

It's a bacteria called Gloeocapsa magma. It feeds on the limestone filler in asphalt shingles and spreads with prevailing wind and rain — which is why the streaks almost always run down the north or shaded side of the roof first.

Is soft washing safe for asphalt shingles?

Yes — soft washing is the ARMA (Asphalt Roofing Manufacturers Association) recommended method. High-pressure washing is not. Soft washing uses low pressure and a sodium hypochlorite-based solution to kill the bacteria without dislodging the protective granules.

How long does a roof cleaning last?

A proper soft wash kills the bacteria at the root and typically keeps a roof clean for 4–6 years in West Michigan. Adding zinc or copper strips at the ridge extends results further by inhibiting regrowth.

How much does roof cleaning cost in Hudsonville MI?

Most residential asphalt roofs in Hudsonville, Jenison and Allendale run $450–$900 depending on pitch, square footage, access and how heavy the algae infestation is.