Exterior Cleaning Blog

What Are the Black Streaks on My Roof — and How Do I Get Rid of Them?

Those dark streaks running down your asphalt shingles aren't dirt or water damage — they're a living algae called Gloeocapsa magma. Here's what you need to know.

This airborne algae feeds on the limestone filler in asphalt shingles and spreads rapidly in humid climates like Georgia's. Left untreated, it can significantly shorten your roof's lifespan — and tank your curb appeal.

The solution: Soft washing with a sodium hypochlorite-based solution kills the algae completely. Pressure washing alone won't do it — the algae will grow back within weeks. A proper soft wash keeps roofs clean for 3–6 years.

5 Signs Your Gutters Need Cleaning Right Now

Don't wait for water damage to tell you your gutters are clogged. Watch for these warning signs:

1. Water pouring over the sides during rain instead of through downspouts
2. Sagging or gutters pulling away from the fascia board
3. Visible plant growth sprouting from gutters
4. Dark streaks or staining on siding below the gutterline
5. Birds or insects congregating near your roofline

Georgia homeowners should aim for at least two cleanings per year — spring and fall — to stay ahead of pine needle and leaf buildup.

Pressure Washing Before Selling: Why It's One of the Best ROI Home Improvements

Listing a home? Exterior cleaning consistently ranks among the highest ROI improvements you can make — at a fraction of the cost of renovations.

Studies show that strong curb appeal can add 5–10% to a home's perceived value and significantly reduce days on market. A clean driveway, fresh-washed siding, and spotless gutters signal a well-maintained home to buyers from the moment they pull up.

Many of our Lake Oconee and Madison area clients schedule a full exterior wash and gutter clean before every listing — and their agents say it makes a measurable difference.

Should You Rent a Pressure Washer or Hire a Professional?

Renting a pressure washer seems like a money-saver — but it often isn't. Here's a quick breakdown:

DIY risks: Consumer rentals typically max at 2,000–2,500 PSI, often insufficient for tough stains. Incorrect distance or angle can etch concrete, damage siding, or void roofing warranties. You're also responsible for transporting, handling, and returning the equipment.

Pro advantages: Commercial equipment reaches 3,500–4,000 PSI with heated water. We bring the right machine for each surface, handle setup and cleanup, and carry liability insurance if anything goes wrong. For most homeowners, professional cleaning saves time, delivers better results, and costs less than you'd think.