Over time, dirt, mold, algae, and stains accumulate on your home’s exterior, making it look older and less inviting. But beyond appearance, these contaminants can cause long-term damage if not properly cleaned.

If you’re wondering whether it’s time to schedule a professional pressure washing service, here are the top signs to look out for.

1. Discolored or Stained Siding

Your siding is constantly exposed to dirt, dust, pollen, and air pollutants. Over time, it can develop streaks, stains, or even green and black patches from mold and algae growth.

• Dark streaks, green patches, or discoloration indicate mold and mildew buildup.
• White chalky residue on vinyl siding means oxidation has begun.
• Dirt and grime cause a dull, faded appearance.

Recommended service. Annual house washing prevents buildup and extends the life of your siding.

2. Black Streaks or Moss on the Roof

If your roof has dark streaks or green moss patches, it’s a sign that algae and moss are breaking down your shingles. This can lead to:

• Roof leaks due to shingle deterioration.
• Weakened shingles that reduce roof lifespan.
• Decreased energy efficiency from moisture retention.

Recommended service. Soft washing every two to three years to protect roofing materials.

3. Dirty and Stained Driveway or Walkways

Oil stains, tire marks, and dirt can make concrete, brick, or asphalt driveways look worn out. If left untreated, these stains weaken the surface and cause cracks over time.

• Oil and grease stains make driveways look unkempt.
• Moss and algae create a slippery hazard.
• Dirt buildup fades and discolors concrete.

Recommended service. Driveway and sidewalk cleaning every six to twelve months for a clean and safe surface.

4. Slippery or Moldy Deck and Patio

Wood and composite decks absorb moisture, making them prone to mold, algae, and mildew growth. If your deck feels slimy or has a greenish tint, it’s time for a professional cleaning.

• Mold and mildew weaken wooden decks, leading to premature rot.
• Algae growth creates a slip hazard.
• Dirt and stains make outdoor spaces less inviting.

Recommended service. Annual deck and patio washing, especially before sealing or staining.

5. Overflowing Gutters and Dark Stains on Fascia

Gutters play a crucial role in directing water away from your home, but when clogged with leaves and debris, they can cause serious water damage. Dark streaks on fascia boards indicate that your gutters are overflowing and staining your home.

• Clogged gutters lead to foundation damage and basement leaks.
• Stains on fascia boards mean water is not draining properly.
• Mold and mildew near gutters can spread to siding.

Recommended service. Gutter cleaning twice a year to maintain proper drainage.

6. Faded Business Exterior and Dirty Storefronts

For commercial properties, a clean exterior is essential for making a great first impression. If your storefront, parking lot, or sidewalks look dirty, customers may assume the business is not well-maintained.

• Dirty awnings and storefronts reduce curb appeal.
• Oil stains and gum buildup in parking lots look unprofessional.
• Mold on exterior walls can damage paint and signage.

Recommended service. Quarterly pressure washing for commercial buildings, parking lots, and sidewalks.

Why Waiting Can Cost You More

Ignoring these warning signs can lead to:

✔ Costly repairs from untreated mold and moisture damage.
✔ Safety hazards from slippery surfaces and clogged gutters.
✔ Decreased property value and poor curb appeal.

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