Our blog is designed to offer

you valuble information about

our pioneering cleaning systems.

For more information please

do not hesitate to contact us.

What Are the White Stains on My Building? - Efflorescence


Have you noticed bricks turning white on your building? Is it powdery? Does it appear to be some kind of mould? We’ve got good and bad news for you! it’s not mould, but it is efflorescence.

Fortunately, this brick discolouration is very common type brick stain, and we at Spectrum know exactly how to tackle it without causing any undue damage or disruption.


Efflorescence: What is It?

So what causes bricks to turn white?

Taken from the French word for “flower”, efflorescence is, in its most simple terms, salt coming out of bricks, masonry or concrete following the evaporation of water from inside the material. To occur, it requires three things to exist within a material: 

Ideally, moisture from within the building’s structure would escape through the mortar, keeping Efflorescence from forming. Sadly, mortar can harden, preventing it from being able to breathe and forcing moisture to escape through the building material. This is when Efflorescence occurs, and it’s what you’re dealing with now.

The salt is often already present within the building, although it can also come from the mortar or be present within the moisture itself in hard water areas. As for moisture, it can either be introduced by external sources (like rain) or already be present internally. Naturally, salt dissolves in water, so when both are present inside brick, masonry or concrete, they form a mixture. It’s this mixture that evaporates, and when it reaches the building’s surface you’re left with white bricks and crystalline masonry stains

Brick Stain - Should You Be Worried?

You needn’t be overly concerned about efflorescence on your property, but you may want to consider the consequences of leaving it untreated. While it poses no risk to the structure of your building—as mentioned, it is not any sort of mould—it is unsightly.

The pale, powdery coating it leaves on buildings could make a poor first impression on clients, residents, customers or guests. Furthermore, it will tarnish the kerb appeal of your property, in turn lowering its value.

For these reasons and more, we recommend dealing with efflorescence sooner rather than later.


How Can You Remove White Powder (Efflorescence) from Bricks?

As unsightly as it is, Efflorescence is not impossible to treat. At Spectrum, we’ve handled an array of stone cleaning and masonry cleaning contracts involving or centred around the buildup of Efflorescence. We know exactly what works and what doesn’t.


Doesn’t Work - DOFF Machine: The DOFF system is undoubtedly a popular stone cleaning method used by countless stone stain removal UK companies, including us at Spectrum. Unfortunately, while it’s ideal for removing a vast array of stains and troublesome organic matter from buildings, it has little impact on ground-in staining like efflorescence. What’s more, the high-pressure nozzle and super-heated spray of the DOFF system can risk causing inadvertent damage to the building. If you’re the owner of a culturally or historically significant building, you’ll want to be cautious around the DOFF system.


Does Work - TORC Machine: Efflorescence requires a lighter touch than the DOFF machine can provide, which is why the TORC system should be your tool of choice. Instead of a high-pressure stream—like the DOFF system—TORC makes use of a unique modular nozzle (available in aperture widths of 5mm - 13mm) to release a swirling vortex spray. While gentle, this spray is remarkably effective, using a mixture of compressed air, water and fine granules to lift efflorescence and other masonry stains.

What Else Can TORC Do?

In addition to removing efflorescence, the TORC machine can effectively handle:



The TORC machine is also the perfect solution for cleaning stains from intricate stone architecture. The replaceable nozzle feature and sensitive controls allow for delicate stone cleaning where possible damage is a concern. 

Brick Stain & Efflorescence Treatment with Spectrum

Spectrum’s team of operatives pride themselves on their wealth of knowledge regarding the maintenance, repair and restoration of building exteriors, particularly when it comes to caring for heritage stone buildings. If you’re looking to entrust your efflorescence-stained building to a reliable team of specialists, you’ve come to the right place with Spectrum. 

We work 100% scaffold-free using IRATA-approved industrial rope access methods. This means that you can enjoy all the benefits of an expert property maintenance service without any of the disruptions of scaffolding for your clients, residents or employees.

Our operatives won’t settle for second-best. They take a bespoke, flexible approach to every problem, not resting until the client is satisfied. We think it’s crucial that our team provides the best service possible. While a "one size fits all" approach works for other companies, it just isn’t good enough for us.

Contact Spectrum today or click here to read more about our services.


Back to Blog Posts

Read Our Major Building Works Blog

Major Building Refurbishment Projects

10th February 2021

A Property Manager’s Guide to a Stone Cleaning Service

17th March 2021

How to Clean Statues

17th June 2021

What Is Rope Access?

6th May 2021

Rope Access in London

8th November 2022

The Ultimate Guide to Softwashing

26th August 2021

What is a Major Building Project?

18th February 2021

What is Brick Repointing?

10th March 2021

Planned Maintenance Contractors

25th February 2021

What Are the Stains On My Brick?

3rd June 2021

Can We Help With Your Specialist Building Cleaning and Restoration Needs?

Call Us On:

020 3551 6206

Email Us On:

We Cover The WHOLE Of The UK!