How to Dilute Bilt Hamber Products Correctly for Best Results

One of the biggest mistakes we see is using too much product. With Bilt Hamber, more does not mean better. These products are designed to work at specific ratios. Get that right, and you achieve maximum cleaning performance, better coverage, and safer results.

Understanding Dilution Ratios

When you see a ratio like 1:10, it means:

• 1 part product
• 10 parts water

So 100ml product + 1000ml water.

Why this matters

• Too strong can stain, strip protection, or leave residue
• Too weak reduces cleaning power
• Correct ratio balances performance and safety

Panel Impact Ratio (PIR)

Bilt Hamber products rely on Panel Impact Ratio (PIR), which is the actual strength of product hitting the panel after the foam lance adds its second dilution stage. The mix inside the bottle is not the final strength.

• Bottle mix does not equal panel strength
• Foam lance adds a second dilution stage
• Ignoring PIR is the most common reason snow foam performs poorly
• Using more product does not improve performance and often reduces it

How to Calculate PIR Step by Step

This is a one-time calibration for your foam lance and pressure washer setup.

Step 1: Fill the foam lance

Fill your foam lance bottle with exactly 1000 ml of clean water using a measuring jug.

Step 2: Set the lance

Set the foam lance to maximum product draw. Keep this setting consistent every wash.

Step 3: Measure total output

Spray the full bottle into a bucket and measure the total liquid collected.

Example:
1000 ml in → 12,000 ml out
This means your setup has a 12:1 dilution

Step 4: Calculate product required

Use this formula:

Product ml = Total output × (PIR ÷ 100)

Example

Step 5: Mix the solution

• Add the calculated product amount into the bottle
• Top up with water to 1000 ml
• Light shake

You now have the correct PIR hitting the panel.

Recommended PIR for Bilt Hamber

• Auto-Foam: Around 4% PIR for proper cleaning
• Touch-Less: 0.5% to 2% depending on dirt level
  

Key Practical Takeaway

Correct PIR means:

• Better cleaning even if foam looks thinner
• Less product usage
• Consistent results every wash

Thick foam does not mean effective cleaning. Correct PIR does.

Bilt Hamber Products That Require Dilution

Product	Image	Category	Application Method	Dilution / PIR	How to Measure	When to Use Stronger	When to Use Weaker	Key Technical Notes
Bilt Hamber Auto Foam		Pre-wash	Foam lance	1% to 5% PIR	Measure foam lance output and calculate PIR	Winter grime, traffic film	Maintenance washes	Designed for dwell cleaning, not aggressive stripping
Bilt Hamber Touch-Less		Pre-wash	Foam lance or sprayer	0.5% to 2% PIR	Same PIR calculation	Heavy dirt, salt	Light dust, coated cars	More concentrated, designed for low PIR cleaning with shorter dwell
Bilt Hamber Auto Wash		Shampoo	Bucket	5ml per 10L (1:2000)	Measure using cap or syringe	Heavily soiled vehicles	Regular maintenance	Excess reduces rinse quality
Bilt Hamber Surfex HD		APC	Pump sprayer	1:5 to 1:30 (up to neat for extreme contamination)	Use ratio bottle	Engine bays, arches (1:5 to 1:10)	Interior, plastics (1:15 to 1:30)	Incorrect dilution can stain or leave residue

Explore Related Blog: 

Bilt Hamber Touch-Less vs Auto-Foam Pre-Wash Snow Foam:  Bilt Hamber Touch-Less vs Auto-Foam Pre-Wash Snow Foam

What Happens If You Dilute Incorrectly and How to Fix

Quick Summary

• Most issues come from adding too much water or guessing ratios
  
• Mixing products like shampoo into snow foam does not improve cleaning
  
• Correct dilution always outperforms stronger mixes
  
  

Foam Lance vs Pump Sprayer

Understanding this is important because dilution behaves differently depending on the equipment you use.

Foam Lance

• Two-stage dilution system
  
• Product is diluted in the bottle and then further diluted by the pressure washer
  
• The final strength hitting the panel is lower than what you mix
  
• Requires Panel Impact Ratio (PIR) calculation
  
• Most users get weak results because they ignore the second dilution stage
  

Example:
Fill 1L bottle, spray full output, calculate PIR, then adjust mixture

Pump Sprayer

• Single-stage dilution system
  
• What you mix is exactly what is applied
  
• No additional dilution
  
• More predictable and easier to control
  
• Ideal for products like Surfex HD

General Tips for Best Results

• Work on cool panels out of direct sunlight
  
• Measure accurately using proper tools
  
• Rinse thoroughly to prevent residue
  
• Start weaker and increase only if needed
  
  

Once dilution and PIR are understood properly, Bilt Hamber products deliver consistent, professional-level results without waste.