Pressure Washing

Pressure washing is a powerful way to clean concrete, brick, and other masonry, but it’s not always the full solution—especially for stubborn stains. Here’s a clear breakdown so you know when plain water works and when you’ll need extra cleaning agents or a trained professional.

👍 Pros of Pressure Washing

• Fast and efficient – Removes dirt, dust, pollen, and loose debris quickly

• Restores appearance – Brightens driveways, patios, sidewalks, and brick walls

• Eco-friendly (sometimes) – Often just uses water (no chemicals needed for basic cleaning)

• Prepares surfaces – Ideal before painting, sealing, or staining

• Removes organic growth – Helps eliminate moss, algae, and mildew

  
  

👎 Cons of Pressure Washing

• Can damage surfaces

  • Too much pressure can etch concrete or erode mortar in brick.

• Doesn’t remove all stains

  • Oil, rust, and deep-set stains usually remain without chemicals

• Water intrusion risk

  • Can force water into cracks, behind siding, or into walls. Never use pressure on the siding of a house, soft washing is the preferred method for cleaning your homes exterior. See my soft washing blog for more information.

• Safety concerns

  • High-pressure spray will cause injury or property damage when used incorrectly.

• Streaking / uneven cleaning

  • Without proper technique, surfaces can look patchy (aka tiger strips)

    
    

When You Need Cleaning Solutions (Not Just Water)

Pressure washing alone works best for surface-level dirt, mold, mildew and algae. You’ll need additional cleaners when stains are absorbed into concrete or brick.

1. Oil & Grease Stains (Driveways, Garage Floors)

• Symptoms: Dark spots that don’t lift with water

• Solution needed:

  • Oil absorbents to lift oil from the porous concrete, Degreasers or alkaline cleaners

• Why: Oil penetrates porous concrete—water alone can’t break it down, but sometimes even professional cleaning cannot remove oil stains if left for long periods of time.

⚠️ Use carefully—degreasers can damage concrete or nearby plants and is harmful if inhaled or if the solution encounters your skin. Please consult a professional when harmful chemicals are needed.

2. Rust Stains

• Symptoms: Orange/brown streaks (often from metal or irrigation water)

• Solution needed:

  • Acid-based cleaners (like oxalic acid)

• Why: Rust chemically bonds to the surface

⚠️ Use carefully—acids can damage concrete or nearby plants and is harmful if inhaled or if the solution encounters your skin. Please consult a professional when harmful chemicals are needed.

3. Mold, Mildew, Algae (Green/Black Growth)

• Common on: Brick walls and patios.

• Solution needed:

  • Sodium hypochlorite-based cleaners or specialized mold removers

• Why: Pressure washing may remove the surface but not kill spores

⚠️ Use carefully—improper use can kill vegetation and irritate your skin if not diluted appropriately.

4. Efflorescence (White Powder on Brick/Concrete)

• Cause: Mineral salts rising to the surface

• Solution needed:

  • Mild acid cleaner (like diluted muriatic acid)

• Why: It’s a chemical deposit, not dirt

⚠️ Use carefully—acids can damage concrete or nearby plants and is harmful if inhaled or if the solution encounters your skin. Please consult a professional when harmful chemicals are needed.

5. Paint, Graffiti, or Sealers

• Solution needed:

  • Paint strippers or solvent-based cleaners

• Why: These bond strongly and resist water pressure

⚠️ Use carefully—acids can damage concrete or nearby plants and is harmful if inhaled or if the solution encounters your skin. Please consult a professional when harmful chemicals are needed.

6. Tire Marks & Embedded Dirt

• Solution needed:

  • Detergents or concrete cleaners

• Why: Friction pushes grime deep into pores

  
  

Pressure Washing vs. Soft Washing

• Pressure washing: High pressure, little/no chemicals

• Soft washing: Lower pressure + cleaning solutions

👉 For brick, soft washing is often safer to avoid mortar damage

Best Practice

For most real-world jobs:

1. Apply appropriate cleaning solution

2. Let it dwell (5–15 minutes)

3. Light-to-moderate pressure rinse

4. This gives better results with less risk of damage. No pressure should ever be used on newly poured concrete. Concrete takes 2-3 years to fully cure. Chemicals at big box stores are severely diluted and rarely will they give you the outcome you are looking for.

   
   

Tell me what specific surface or stain you’re dealing with (driveway oil, red clay, brick mildew, etc.), and I can recommend the exact cleaner and method. Call/text 706-474-0067 for a free no obligation quote.