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The Science Behind Roof Cleaning: What You Need to Know

By Mark Cave December 25, 2023

The Science Behind Roof Cleaning: What You Need to Know

Roof cleaning is more than just an aesthetic choice. Over time, weather elements, algae, moss and other environmental factors can significantly damage our roofs. A clean, well-maintained roof not only looks great, but also extends the life of the roof materials. But how do we ensure the cleaning process is secure and effective? One answer is Soft Washing.

What is Soft Washing?

Soft washing is a gentle, effective cleaning process that utilizes low-pressure water flow and specialized solutions to clean surfaces without causing structural harm. Unlike pressure washing, soft washing doesn't risk stripping away materials or causing water damage, thus making it an ideal roof cleaning method. Find out more about Soft Washing here

The Science Behind Soft Washing

At its core, Soft Washing involves a combination of soaps, bleach, and water. The chemical said to be the most effective Cleaner is Sodium Hypochlorite. Find out if Sodium Hypochlorite bleaches surfaces Here

One 'secret weapon' in the Soft Washing industry is the clever wash surfactant, it helps cleaning solutions 'stick' to the roof surface, effectively removing dirt and algae. Learn more about surfactants, often overlooked but a critical component in Soft Washing here

The Importance of Regular Roof Cleaning

Regular roof cleaning prevents the accumulation of moss, which can lead to roof damage over time. To deal with moss, SoftWash UK has a dedicated Roof Moss Killer, the Moss Guard Pro here It destroys the moss and inhibits new growth.

The evidence is clear: roof cleaning is an essential part of home maintenance, and Soft Washing is undoubtedly one of the safest, most effective solutions out there.

Learn Soft Washing

Given the popularity of Soft Washing, getting hands-on training on this new method can prove to be a profitable investment for your exterior cleaning business. SoftWash UK offers dedicated soft wash training courses. Find out more about these courses here


From understanding the basis of Soft Washing to realizing the importance of regular roof cleaning, this post has highlighted essential aspects of sustainable roof maintenance. Remember, preserving your roof's integrity is a worthy investment. A clean roof is not merely subjective appeal; it's a functional requirement for a healthy home.

Visit SoftWash UK Ltd for expert services, necessary equipment, and additional information for all your roof cleaning needs. Our team of experts is ever-ready to assist you with information and support to ensure that roofs remain not just aesthetic but also functional. Contact us today!

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  • Hello,

    Thank you so much for your kind words! I’m thrilled to hear that you enjoyed the blog post on the science behind roof cleaning. It’s great to know that the information provided is helpful to you and potentially many others searching for insights on this topic.

    At SoftWash UK, we aim to share our expertise and knowledge to help people understand the best practices and the science involved in effective and safe roof cleaning. Your feedback motivates us to continue creating informative content that can aid and educate.

    If you have any specific questions or topics you’d like us to cover in future articles, please feel free to let us know. We’re always here to help!

    Best regards,
    Mark Cave
    SoftWash UK

    Mark Cave on

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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.



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