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Soft Washing Biocides: Safe, Effective Exterior Cleaning Guide

By Mark Cave June 13, 2026

Everything You Need to Know About Soft Washing Biocides

Soft washing is an effective technique for cleaning exterior surfaces, using specially formulated biocides to achieve impressive results. Unlike high-pressure washing, soft washing utilises low-pressure sprays and chemical solutions to remove persistent organic growth. In this guide, we explore the crucial role of biocides in soft washing and provide insights for professional cleaning contractors and DIY enthusiasts.

Understanding Soft Washing Biocides

Biocides are chemical substances designed to eliminate or inhibit harmful organisms such as mould, algae, lichen, and bacteria. In the context of soft washing, biocides are essential for maintaining the aesthetic appeal and structural integrity of exterior surfaces like render, roofs, and driveways. They break down organic matter without damaging delicate surfaces, making them ideal for properties of all types.

Advantages of Using Biocides in Soft Washing

  • Long-lasting Results: Biocides not only clean but also inhibit future growth, providing a longer-lasting clean compared to mechanical washing alone.
  • Eco-Friendly Options: Many biocides are biodegradable and safe for the environment when used as directed, making them a responsible choice for eco-conscious contractors.
  • Efficient Cleaning: By effectively targeting organic growth, biocides minimise the need for repeated cleaning, saving time and resources.

Safe Practices for Using Biocides

Safety is paramount when working with any chemical, including biocides. Professionals and DIY users alike should adhere to the following practices:

  • Always wear appropriate safety gear, including gloves and goggles.
  • Read and follow the manufacturer’s instructions for proper dilution and application.
  • Avoid application on windy days to prevent drift to unintended areas.
  • Consider environmental impact and use biocides that are safe for local wildlife and plants.

How to Select the Right Biocide

Choosing the right biocide can influence the effectiveness of your cleaning project. Look for products specifically formulated for your target surfaces. For instance, Soft Wash Pro 50 DDAC is a professional-grade option suitable for various applications. Additionally, consider the product's concentration, ease of use, and safety profile.

Enhance Your Skills with Professional Training

For those looking to deepen their understanding of soft washing techniques and safety measures, enrolling in a comprehensive training course is invaluable. The Soft Wash Training Course offered by SoftWash UK equips you with essential knowledge and skills, ensuring you can deliver results with confidence.

FAQ About Soft Washing Biocides

  • Are biocides safe to use around pets?
    When applied correctly and allowed to dry, many biocides are safe. Always check the product's safety data and keep pets away during application.
  • Can I use biocides on all exterior surfaces?
    Biocides work well on most surfaces, but it’s important to verify compatibility, especially with more delicate materials.
  • What's the difference between a biocide and a cleaner?
    While cleaners remove surface dirt, biocides target and inhibit the growth of organic matter, preventing regrowth.

Conclusion

Biocides are crucial components of the soft washing process, offering deep cleaning and long-lasting protection against organic growth. By selecting the right products and applying them with care, professionals and homeowners can achieve outstanding results. To access high-quality biocides, equipment, and training, visit SoftWash UK, your trusted partner in exterior cleaning success.

Whether you're a seasoned contractor or a proud DIY enthusiast, explore our Softwashing Knowledge Hub for more tips and insights, or browse the range of exceptional Soft Wash Chemicals to elevate your cleaning solutions.


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Soft Wash Calculator App

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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!.
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- 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.



 

 

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