Professional Block Paving Cleaning in South Croydon
Table of Contents
What Professional Block Paving Cleaning Actually Involves
Why DIY Pressure Washing Leaves Stripes and Damage
Block Paving Re-sanding in South Croydon: Why the Joints Matter
Patio Black Spot Removal: What It Is and How It Is Treated
Driveway Maintenance Services: Keeping Paving Cared For
Repairs, Repointing and Sealing: When They Are Needed
Choosing a Professional Block Paving Cleaning Service
Frequently Asked Questions
Last Updated: September 23, 2026
What Professional Block Paving Cleaning Actually Involves
Professional block paving cleaning is a staged process rather than a single wash-down. It starts with a survey of the paving, its joints and its bedding, then moves through biocidal pretreatment, a controlled deep clean, any necessary repairs, re-sanding, and sealing only where the surface suits it.
At SavingPaving, we have restored existing driveways and patios across South Croydon and Bromley since 2001, and the survey always comes first. It tells us what the paving actually needs, rather than what a pressure washer alone can do.
The order matters, and it is rarely the order homeowners expect:
Assess the paving, joints and any loose or sunken areas
Apply a biocidal pretreatment where growth is established
Allow a suitable dwell time before cleaning begins
Clean professionally, with pressure and method matched to the surface
Complete repairs before any jointing work
Allow the paving and joints to dry suitably
Apply kiln-dried jointing sand to block paving
Seal only where suitable and agreed
Pro Tip The dwell time after biocidal pretreatment is the step most people skip. Rushing straight to the pressure washer means the treatment has not had time to work, and regrowth appears sooner than it should.
Why DIY Pressure Washing Leaves Stripes and Damage
Stripes appear when a pressure washer is held too close, moved too slowly, or set too high for the surface. The result is uneven cleaning, where some areas are stripped back further than others, and on softer paving it can mean surface loss that no amount of further cleaning will even out.
The bigger risk is what happens beneath. A powerful jet drives water into the joints and under the paving, washing out the jointing sand that keeps block paving stable and tidy. Once that sand is gone, joints open up, debris collects, and weeds and moss find it easier to take hold.
Pressure washing also does nothing about black spot or lichen. These are living growths on the paving surface, and blasting them simply spreads moisture and fragments. A measured approach, using the right pressure, equipment and chemicals for the paving type, cleans more evenly and does less harm. The guidance on safe use of pressure washers from the Royal Society for the Prevention of Accidents is worth a read before hiring or buying one for a driveway.
Block Paving Re-sanding in South Croydon: Why the Joints Matter
Block paving re-sanding South Croydon homeowners ask about is the step that finishes a clean properly. After cleaning and any repairs, kiln-dried jointing sand is brushed into the joints and compacted so the paving sits as a tidy, finished surface.
Jointing sand is not the same as repointing. Block paving is re-sanded, not repointed with mortar. The sand fills the joints, helps limit how much debris collects, and supports the appearance of the paving. It does not secure inadequately bedded blocks, and it will not hold down paving that is already rocking or sinking.
That distinction matters. If blocks are loose or the surface has dipped, the cause is usually in the bedding or sub-base beneath, and re-sanding alone will not fix it. Those areas need to be assessed, and where appropriate lifted and relaid, before any sand goes back in. Local bedding problems can sometimes be repaired. Widespread failure may point towards reconstruction or replacement, and an honest survey will tell you which you are facing.
Patio Black Spot Removal: What It Is and How It Is Treated
Patio black spot removal targets a common surface growth on natural stone and concrete paving, not a fault in the joints. Black spot and lichen colonise suitable paving surfaces over time, particularly in shaded or damp areas, and they are not caused by failed pointing.
Treatment is a separate stage from cleaning. A suitable black spot or lichen treatment is applied, given time to work, and then followed by professional cleaning. On some surfaces this needs more than one visit, depending on how established the growth is.
Two things are worth being clear about. First, treatment, jointing and sealing may reduce growth, but no process guarantees permanent prevention. Second, growth returns over time, which is why aftercare matters. It is also why black spot should never be blamed on open joints, and why simply blasting it with a pressure washer tends to make the problem look worse rather than better. SavingPaving's black spot removal service covers assessment and treatment suited to the paving in question.
Driveway Maintenance Services: Keeping Paving Cared For
Driveway maintenance services are routine aftercare, not deep cleaning. They keep paving looking cared for between larger restoration visits and reduce the build-up of moss, algae, lichen and weeds.
SavingPaving's maintenance programme normally involves a six-monthly visit. On each visit, debris is swept or blown away, an appropriate biocidal treatment is reapplied, and early regrowth is targeted before it becomes established. That is the whole scope. Maintenance does not automatically include deep cleaning, repairs, repointing, re-sanding or sealing. Those are separate services, carried out only when required and agreed.
Think of it as keeping on top of the surface rather than restoring it. Homeowners who have had a full clean, repair and re-sand often find a maintenance visit is all that is needed to hold that result for longer.
Repairs, Repointing and Sealing: When They Are Needed
Repointing and sealing are not automatic parts of a clean. They are separate services, and whether they are needed depends on the paving type, its condition and its construction.
On slabbed patios, natural stone and crazy paving, failed pointing is removed and the joints are repointed or, where suitable, finished with a two-part resin jointing system. Resin jointing is only considered for stable paving with prepared joints. Suitability depends on the paving, the bedding, joint dimensions, drainage, exposure and site conditions, and a correctly specified and installed system may provide a durable finish where it suits the surface. It is not a fix for movement, and it is not recommended where paving is loose or sunken.
Sealing is similarly conditional. Where appropriate and agreed, a suitable sealer may help protect a restored surface, but it is chosen to match the paving rather than applied as standard. If your driveway or patio has loose, cracked or sunken areas, our repairs service covers assessment, lifting and relaying where that is the right course.
Watch Out Never accept jointing work as a solution for rocking or sunken slabs. Jointing fills and finishes prepared joints; it does not secure inadequately bedded paving. If a contractor offers to "lock in" moving slabs with resin or mortar, the underlying bedding problem has not been addressed.
Choosing a Professional Block Paving Cleaning Service
Choose a service that surveys before it quotes, explains what your paving actually needs, and separates cleaning from repairs, re-sanding and sealing. Those three habits tell you more about a company than any glossy before-and-after photo.
Questions worth asking:
Will someone visit and assess the paving before quoting?
Is the quotation itemised, so you can see what each stage covers?
Are staff uniformed and fully insured?
Are you told in advance what happens if worse is found underneath?
Is the cleaning method matched to the paving type?
Is aftercare offered, or is the job finished at the gate?
On the last point, be wary of anyone promising permanent results or that growth will never return.
Stage | What It Involves | When It Is Needed |
Survey | Assessment of paving, joints and bedding | Always, before any quote |
Biocidal pretreatment | Treatment applied and left to dwell | Where growth is established |
Professional cleaning | Pressure and method matched to surface | Every restoration |
Repairs | Lifting and relaying loose or sunken paving | Where bedding has failed locally |
Re-sanding | Kiln-dried jointing sand, compacted in | Block paving, after cleaning |
Repointing or resin jointing | Failed pointing removed, joints refinished | Slabbed patios, natural stone, crazy paving |
Sealing | Suitable sealer applied | Only where appropriate and agreed |
Maintenance | Six-monthly sweep and biocidal reapplication | Ongoing aftercare |
Frequently Asked Questions
How often should block paving be professionally cleaned?
It depends on shade, tree cover and how much the driveway is used, so there is no single schedule that suits every home. Many driveways benefit from a professional clean every couple of years, with lighter upkeep in between. Where moss, algae and weeds return quickly, a six-monthly maintenance visit can keep growth in check and reduce the build-up between deeper cleans. SavingPaving surveys each driveway and recommends a realistic interval rather than a fixed rule, and maintenance visits are separate from deep cleaning, repairs, re-sanding or sealing.
Can professional cleaning remove black spot and lichen from paving?
In most cases it can, but results depend on the paving type and how long the growth has been established. Black spot and lichen colonise suitable surfaces and are not caused by failed joints, so treatment targets the growth itself. A biocidal pretreatment is applied and given suitable dwell time before cleaning, with further treatment where needed. Some deep-set lichen may lighten rather than disappear completely, and treatment, jointing and sealing may reduce regrowth but cannot guarantee permanent prevention.
What is the difference between re-sanding and repointing?
Re-sanding applies to block paving: kiln-dried jointing sand is compacted into properly prepared joints once the paving and joints have dried suitably. Repointing applies to slabbed patios, natural stone and crazy paving, where failed pointing is removed and the joints are refilled with sand-and-cement mortar or a two-part resin system, depending on the paving and its condition. Block paving is not repointed with mortar. If you have seen the phrase patio regrouting, repointing or jointing is normally the correct term.
What is included in a professional paving maintenance programme?
A maintenance visit is routine aftercare following cleaning or restoration. SavingPaving's programme normally involves a six-monthly visit to sweep or blow away debris, reapply an appropriate biocidal treatment and target early regrowth, so the paving stays looking cared for and moss, algae, lichen and weeds are less able to build up. Deep cleaning, repairs, repointing, re-sanding and sealing are separate services, completed only when required and agreed after assessment.
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