Brick cleaning, at the lowest pressure that works
Brick has a fired outer skin and mortar softer than the brick around it. Both are removable in an afternoon and neither grows back. Get matched with crews who test a panel before they clean a wall.
What is brick & masonry cleaning?
Brick and masonry cleaning removes soot, atmospheric grime, biological growth, efflorescence and sometimes paint from brick, stone and mortar. It is governed by a principle borrowed from building conservation: use the gentlest method that achieves an acceptable result, and prove it on a test panel before touching the elevation. The reason is physical. Fired brick has a hard outer skin, mortar is deliberately softer than the units it joins, and aggressive cleaning removes both permanently.
How brick & masonry cleaning actually works
Identify the masonry and its era before choosing anything
Modern extruded brick, soft handmade brick, natural stone and cast stone tolerate completely different treatment, and so do lime mortar and modern cement mortar. Age is the fastest proxy: older buildings generally have softer units and softer joints, and both are more easily damaged than they look.
Watch forA quote given without anyone touching the wall. Soft handmade brick and hard modern brick are the same colour from the pavement and are not the same job.
Diagnose the soiling - it is not all one thing
Biological growth, atmospheric grime, efflorescence, metallic staining and paint each have a different removal route. Efflorescence in particular is not soiling at all: it is salt carried out of the masonry by moisture moving through it, and it will keep arriving as long as the moisture does.
Watch forA single method proposed for a wall showing several problems. It will over-treat some areas to under-treat others, and on masonry the over-treated areas are the permanent ones.
Test a panel, in an inconspicuous place, and wait
A small trial area is cleaned by the proposed method and then assessed - not while wet, but after it has fully dried, which is when discolouration, mortar loss and unevenness actually become visible. If the result is unacceptable the method changes and the panel is repeated.
Watch forAny contractor who considers a test panel unnecessary or wants to judge it wet. Masonry looks uniformly excellent while it is wet. That is precisely why the test exists.
Work up from the gentlest method
The sequence runs from water and time, to detergent, to a chemical treatment appropriate to the soiling, escalating only when the gentler option has demonstrably failed. Pressure stays low throughout - the National Park Service recommends beginning at or below 100 psi on historic masonry and generally staying under 300 to 400 psi, which is a fraction of what a driveway job uses.
Watch forStarting at the strong end "to save a visit", and any mention of abrasive blasting. Blasting removes the fired skin of the brick, and the wall is left permanently more absorbent than it was designed to be.
Control water, then rinse thoroughly and neutralise
Masonry absorbs. Openings, vents, air bricks and any defective pointing are the routes water takes inside, and they are protected before work rather than mopped up after. Chemical treatments are rinsed and, where the product requires it, neutralised - residue left in the pores continues to act.
Watch forSaturating a solid wall on a house with no cavity. Water driven into the mass takes a long time to come back out, and where it comes out on the inside face you get damp and salt bloom on the plaster months later.
Assess the joints once the wall is clean and dry
Cleaning routinely reveals pointing in worse condition than the dirt suggested, and any joints lost during cleaning need making good. Repointing is masonry work with its own mortar-specification questions, not something a cleaning crew improvises at the end of the day.
Watch forOpen joints left open through a winter. That is direct water ingress into the wall, and it does far more damage over one wet season than the dirt ever did.
What does brick & masonry cleaning cost?
Masonry cleaning is quoted after inspection and usually after a test panel, priced on area, access, the method the panel proves out, and the condition of the joints. Repointing and paint removal are separate works with their own quotes. The Cost Guide explains how masonry pricing is structured.
See the full brick & masonry cleaning cost guide - by material, size and region →
If the number is the problem, here are the ways people pay for it →
Exterior cleaning tools → Size the elevations and note the joint condition before you take quotes.
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When brick & masonry cleaning is the wrong call
When saying yes is the wrong move:
- The pointing has already failed. Washing a wall with open, sandy or missing joints pushes water straight into the wall core. Repoint first with a mortar matched to the existing, clean after - doing it the other way round means cleaning twice or damaging fresh mortar.
- The building is historic, listed or in a conservation area. Cleaning may need consent, and the appropriate method is set by conservation guidance rather than by a contractor's usual practice. Get the advice before you get the quotes, not after somebody has cleaned a test panel you cannot undo.
- Somebody is proposing sandblasting or any abrasive method. Abrasive cleaning strips the fired face of the brick and erodes mortar. It is one of the few things on a house that cannot be put back, and the resulting absorbency drives damp problems for decades afterwards.
- The problem is efflorescence and nobody has asked where the water is coming from. That bloom is salt arriving from inside the masonry. Wash it off and the same moisture path delivers the next one. The useful work is finding the leak, the bridged damp course or the failed flashing.
- You want painted brick stripped and you have not tested it. Paint removal from masonry is a specialist job with a real risk of taking face material with the coating and of leaving ghosting that is worse than the paint. It needs its own trial area and its own decision, separate from cleaning.
- A freeze is forecast within a few days. Masonry holds water long after the surface looks dry, and saturated brick that freezes can spall - the face pops off in flakes. This is the most avoidable form of cleaning damage there is.
Types of brick & masonry cleaning
| Option | What it means for you |
|---|---|
| Cleaning methods compared | Water, detergent, chemical and where each stops being appropriate. |
| Efflorescence and masonry staining | Identify what is on the wall before choosing how to remove it. |
| Soft washing | For growth on masonry, low pressure and chemistry is usually the route. |
What to check when hiring for brick & masonry cleaning
- Will you clean a test panel and let it dry before we agree the method? The single question that separates masonry cleaners from pressure washers. There is no defensible reason to refuse, and wet masonry tells you nothing.
- What pressure will you use, and what would make you go higher? You want a low number and a reluctance to raise it. Enthusiasm about pressure on a brick wall is the same warning it is anywhere else in this trade, only less reversible.
- How will you judge whether my mortar can take this? Mortar is intentionally the sacrificial part of a wall. A contractor who has not thought about the joints has only thought about half the surface.
- If chemicals are used, what are they, and does the product require neutralising or a particular rinse? Some masonry chemistry keeps acting until it is rinsed properly, and residue is a common cause of staining that appears weeks later. The answer should be specific to a product, not general.
- What is your plan for water getting into the wall - vents, sills, open joints, air bricks? On solid masonry the risk is inside, not outside. A crew that has walked the elevation looking for entry points is thinking about the building rather than the surface.
- Have you cleaned masonry of this age and type before, and can I see it? Masonry work photographs badly wet and honestly dry. Ask for a job that has been finished long enough to have dried out and weathered a little.
- What might look worse after cleaning than it does now? Cleaning reveals patched brick, mismatched repointing, previous repairs and paint ghosting that dirt was hiding. Being told in advance is the difference between a result and a shock.
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Often done at the same time
Sources
Sources last checked
- Water runoff and cleaning chemicalsU.S. Environmental Protection AgencyRetrieved 2026-08-04Stormwater discharge context when exterior cleaning enters drains.
- Occupational Employment and Wages — Construction TradesU.S. Bureau of Labor StatisticsRetrieved 2026-08-04Labor cost context for home-services trades nationally.
Sources for figures and claims on this page.
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