Stop scrubbing. Start using the system that does the work for you.
Two-step washing is built for operators dealing with heavy grime, mineral staining and complex surfaces. Instead of relying on aggressive chemicals or manual effort, it uses controlled application, dwell time and the right setup to deliver consistent results across fleets.
What is Two-Step Washing?
Two-step washing uses two chemicals applied in sequence to break down different types of contamination.
Step 1 – Acid Wash (Low pH)
Breaks down mineral-based contamination like calcium, red dirt and road film.
Step 2 – Alkaline Detergent (High pH)
Lifts oils, grease and remaining grime.
This allows the chemical to do the work, reducing the need for brushing and manual effort.
Where it Works Best
Two-step washing is ideal for:
- Concrete agitators and equipment
- Water trucks with calcium staining
- Fleet vehicles exposed to red dirt and mineral deposits
- Garbage trucks, tippers, cranes and excavators
- Equipment with irregular shapes where brushes can’t reach
If the contamination is mineral-based, this system works.
Why Use a Two-Step System
- Cuts cleaning time across fleets
- Reduces brushing and manual labour
- Cleans into joints, seams and hard-to-reach areas
- Delivers consistent results across vehicles
- Reduces risk of micro-scratching from brushing
How it Works
- Pre-wet the surface: Never apply acid to a dry surface.
- Apply Acid Wash (Step 1): Apply using controlled spray or foam. Do not allow to dry.
- Apply Alkaline Detergent (Step 2): Apply over the top while the acid is still active.
- Rinse Thoroughly: Use high pressure to remove all residues.
Application Method Matters
How the chemical is applied directly affects how it behaves:
- Mist application → deeper penetration, more aggressive
- Foam application → increased dwell time, more controlled
- Flooding → less penetration, lower impact
Incorrect application can lead to inconsistent results or surface damage.
System Requirements
Two-step washing is not a basic setup.
To get the result safely and consistently, you need:
- High-pressure chemical injection system (e.g. ST160)
- Stainless steel injectors suited for acid application
- Correct nozzle and dilution setup
- Operator understanding of surfaces and dwell time
The system setup matters more than the chemical itself.
Training Required
This is a trained process, not a general cleaning method.
- Operators must understand surfaces and application methods
- Incorrect use can damage paint and finishes
- Correct use delivers fast, repeatable results
Safety & Handing
This is a professional-use product. Incorrect use can cause surface damage or injury.
- Always wear appropriate PPE
- Always apply to a wet surface — never apply to dry surfaces
- Do not allow product to dry on surfaces
- Do not exceed recommended dwell time
- Always test on a small, inconspicuous area before full application
- Use correct dilution, equipment and application method
- Incorrect application (mist, foam or flood) can increase risk of damage
- Avoid use on hot surfaces or in direct sunlight
- Take care on aluminium, painted and sensitive surfaces
- Avoid uncontrolled runoff into the environment
- Carry calcium gluconate gel when handling acid-based products
Is this Right for You?
This system is suited to operators who:
- Wash fleets regularly
- Deal with mineral-based contamination
- Want to reduce labour and cleaning time
- Are prepared to invest in proper setup and training
If you’re looking for a quick spot cleaner, this isn’t it.
If you want a repeatable, scalable system that gets the job done properly, this is where it fits.
Recommended System Setup
To get the best results, use the full FlowRPM system:
Step 1: FlowRPM Acid Wash & Brightener
Step 2: FlowRPM Touchless Fleet Wash
System: SPITWATER pressure cleaner with chemical injection setup
Optional:
- Foam system for increased dwell time
- Applicators for detailed cleaning
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