A Step-by-Step Guide to Safely Soft Washing a House or Building

Soft washing is one of the most effective and safest ways to clean exterior surfaces when done correctly. Follow this step-by-step guide to ensure high-quality results while protecting the property and surrounding areas.

1. Arrival & Setup

Arrive on-site, greet the customer if they are present, and connect to the water supply. Establish clear communication and confirm the scope of work before getting started. Point out any irrigation stains, oxidation, etc. 

2. Protect Electrical Components

Tape off all exterior electrical components such as outlets, doorbells, and fixtures so that your soft washing solution doesn’t trickle down behind them onto the working. Leave soffit outlets and cameras untaped, but make a mental note of their location so you can avoid direct spraying. These areas should be cleaned carefully using a brush, or a rag. Ensure all doors and windows are fully closed before proceeding.

3. Property Inspection & Documentation

Perform a thorough walk-around and take detailed photos of each side of the home or building.

Document any pre-existing damage, including:

• Broken or cracked windows

• Oxidation

• Corroded fixtures

• Faded or spotted paint/stain

Also photograph areas with movable items so everything can be returned to its original position after cleaning.

4. Identify Sensitive Surfaces

Take note of materials that could be negatively affected by your cleaning solution, such as:

• Stained wood

• Galvalume or metal roofing

• Anodized aluminum

• Aluminum composite materials

• Chrome or specialty finishes

Create a plan to safely clean around these areas without causing damage.

5. Choose Your Application Method

Determine the best method for applying your solution:

Down streaming (most common) for application and rinse

Dedicated soft wash systems (12V, gas, or air-powered)

Select the method based on the job size, surface type, and efficiency.

6. Hose Setup

Run your hose to the furthest point of the backside of the structure. Be careful to avoid snagging on sprinkler heads, landscaping, or lighting. Position your hose so you can clean one side of the building at a time efficiently.

7. Pre-Wet All Surfaces

Pre-wet all areas before applying any cleaning solution, including:

• Siding

• Soffits and fascia

• Drip edge

• Roof edge (especially metal roofs)

Thoroughly soak nearby plants, grass, stained wood, and other sensitive surfaces to minimize the risk of chemical damage.

8. Apply Cleaning Solution

Apply your soft wash solution to cooled, pre-wet surfaces from the bottom up. A 1% Sodium Hypochlorite (SH) solution is typically effective for removing organic stains on non-porous surfaces. You can add a small amount of surfactant (such as Thick Lemon Soft Wash Surfactant) to improve dwell time and cleaning performance.

For tougher surfaces like brick or stucco, stronger SH solutions may be required. In these cases, a pump sprayer is often more efficient than adjusting your metering manifold on dedicated pump systems. 

Use a soft bristle brush for light agitation if needed, especially on gutters, siding, and windows.

9. Rinse Thoroughly

Before rinsing, re-wet all surrounding plants and sensitive areas, then wet siding and windows again from the bottom up and begin rinsing from the roofline down once you reach the top. Rinse windows multiple times to prevent streaking caused by soap residue or oxidation runoff from the frames. 

10. Work Methodically

Complete one side of the building at a time, ensuring a consistent, high-quality finish before moving on.

If the job includes restoration services (such as oxidation or irrigation stain removal), handle those areas while you are already set up on that side.

11. Apply Protective Coatings (Optional)

If applying a protective coating such as Preserver Pro Hydrophobic UV Protector, do so only after the entire soft washing process is complete. Bleach (SH) will break down wax-based coatings, so timing is critical.

12. Final Inspection

Perform a final walkthrough of the property and check for streaked windows and dust/debris run off from weep-holes and soffit vents. Touch up any areas as needed.

13. Cleanup & Finishing Touches

Remove all tape from electrical components. Use a damp rag to wipe down outlet covers, electrical boxes, and any remaining residue to leave a clean, professional finish.

Final Thoughts

Taking the time to follow a structured process not only improves your results but also protects the property, builds trust with your customer, and sets your service apart from the hundreds of competitors in any given area offering exterior cleaning services.