Soft Washing with Sodium Hypochlorite: A Comprehensive Guide

By Mark Cave June 12, 2026

Soft Washing with Sodium Hypochlorite: A Comprehensive Guide

In the exterior cleaning industry, soft washing has gained prominence as a safe and effective method for removing dirt, algae, moss, and other contaminants from various surfaces. At the heart of this approach is sodium hypochlorite, a powerful chemical that ensures surfaces stay clean for longer. This guide explores the use of sodium hypochlorite in soft washing, offering valuable insights for UK exterior cleaning contractors, property maintenance professionals, and enthusiastic DIYers.

Understanding Soft Washing and Sodium Hypochlorite

Soft washing is a low-pressure cleaning method that utilises a mixture of water, cleaning chemicals, and sometimes surfactants to thoroughly clean exterior surfaces. Unlike pressure washing, which can damage surfaces, soft washing is gentle yet effective, making it suitable for roofs, render, and delicate exteriors.

Sodium hypochlorite, commonly found in bleach, is the key chemical used in soft washing. It is highly effective in breaking down organic matter and killing mould, mildew, and bacteria, ensuring surfaces are not just clean but also sanitised.

Advantages of Using Sodium Hypochlorite

Effective Cleaning: Sodium hypochlorite’s strong oxidising properties break down organic stains and organisms swiftly.
Long-lasting Results: Surfaces remain cleaner for longer as it inhibits the regrowth of algae and mould.
Cost-effective: It is a relatively inexpensive solution that delivers professional results.

Practical Soft Washing Advice

To achieve the best results, it is crucial to follow best practices when using sodium hypochlorite in soft washing:

Correct Mixing Ratios: Follow recommended ratios for diluting sodium hypochlorite to ensure safety and effectiveness. This typically ranges between 3-6% concentration for household solutions.
Use a Proper Surfactant: Employ a surfactant like Clever Wash Surfactant to improve the cleaning solution’s adherence to surfaces.
Appropriate Equipment: Invest in specialised equipment such as the Clever Injector Dosatron for precise chemical delivery.

Safety and Best Practices

Safety is paramount when working with sodium hypochlorite:

Wear Protective Gear: Always use gloves, goggles, and protective clothing to avoid chemical burns and irritation.
Avoid Contamination: Cover surrounding plants and use barriers to prevent runoff from affecting non-target areas.
Ventilate: Ensure good ventilation if working in enclosed spaces to avoid inhaling fumes.

For more detailed guidance, consider enrolling in a Soft Wash Training Course to enhance your skills and safety knowledge.

Frequently Asked Questions

1. Can sodium hypochlorite damage surfaces?
While it's generally safe when used correctly, improper concentrations or application can lead to discolouration or damage. Always test on a small area first.

2. How often should surfaces be soft washed?
This largely depends on environmental conditions, but typically, surfaces should be cleaned every 12 to 24 months to maintain their appearance.

3. Is soft washing eco-friendly?
Yes, particularly when using biodegradable surfactants and ensuring proper runoff management to protect surrounding vegetation and waterways.

Conclusion

Soft washing with sodium hypochlorite is an excellent method for maintaining the aesthetic and structural integrity of exterior surfaces. By understanding the correct techniques and safety protocols, both professionals and DIY enthusiasts can achieve remarkable results.

For top-quality soft washing chemicals, equipment, and training, visit SoftWash UK for a comprehensive range of products and expertise.

Explore our Softwashing Knowledge Hub for more expert advice and insights into this effective cleaning technique.

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Soft Wash Calculator App

Now you can say I've got an app for that!

Available NOW Click Here To Download

Softwashing calculator is an indispensable tool for juggling complicated chemical mixes. It helps reduce wastage and keeps operating costs down by giving accurate proportions

If you are having difficulty getting your head around the maths, trying to work out what percentage of softwash you need, how much chemical, surfactant and water to add, then this is the App for you.

The Soft Wash Calculator App allows you to work out your soft wash recipe by telling you exactly how much chemical, how much water and how much surfactant to add to get the desired soft wash recipe.
It doesn't stop there!.
- It can also remix your leftover softwash to a new stronger or weaker recipe.
- all controls in one place for see at a glance operation
- ease of input via pre-loaded dials. no more calculator style typing
- instantly responds to changes of complex combinations
- works in both Litres and US Gallons
- tested for Protan and Deutan colourblind users
- links to SoftwashingUK website

Take this scenario
You started with a 1% soft wash recipe of 50 gal (or litres) for a deck clean and you’re left with 13 gallons.

You get a call from a prospective customer to clean their roof. Past experience tells you a 4% soft wash recipe is needed, but what about your leftover mix at 1%?.

Do you waste time and effort driving back to base to transfer into a standby tank?
You could consider the 13 gal as just water, top up the tank and start again.
But that’s throwing away the value of the mix and raising your overhead.

Soft Wash Calculator App to the rescue.

You get to the new job and it requires 100 gal / litres.
Switch into remix mode , confirming the 13 gal already in the tank
Move the dials to your new recipe and the app immediately updates the different amounts to add in front of your eyes including the correct amount of extra surfactant.

You now have a 100 gal / litres tank of 4% soft wash recipe ready for your roof clean job!

Not forgetting you’ve saved money too, all without stress and uncertainty . Don’t underestimate what confident calmness has on your customer putting out referrals.

The same applies if you have a 4% recipe left in your tank and you need to dilute it down to 2%. Again the app will tell you how.

Softwashing calculator will also work for any chemical recipe. For instance you can use it for Sodium Hypochlorite, Bleach, Biocide , TFR traffic film remover and degreaser. Even the mathematically-challenged rocket scientist can top up their booster tanks to new fuel mixes after launch delays caused by changing weather conditions.

Using this app you will know exactly what chemical strength to put on any surface giving you the confidence and the knowledge of a professional soft washer and you’ll save money as well.

So if you have little knowledge of how to mix a soft wash recipe then this app is for you.
If you have little knowledge of how to remix a soft wash recipe then this app is for you.
If you want to save money when mixing a soft wash recipe then this app is for you.

This app is also backward compatible to devices running iOS7. We've done this so you can re-purpose an old iPhone 4 or iPod Touch 5 for what could be hazardous work environments. Just toss one in your cleaning van's toolkit.

Once you learn the methods and procedures of how to apply the soft wash to the different surfaces that need cleaning you’ll be unstoppable!

The app also has a guide to what percentage for what surface. And if you are the lucky owner of a Clever Injector it will remind you the correct setting for the job.
However you should always consider and risk assess what soft wash recipe you need to clean the surface.

** A major iOS code-base change may require a re-purchase. The appiverse at the time will confirm our promise that we won't do so unless the necessity is apparent.