Patio Cleaner vs Pressure Washer: Head or Chemical
Updated: 15.10.2026
You are looking at a green patio after a wet spring, with a pressure washer in the shed or a bottle still to buy. Patio cleaner vs pressure washer is that choice: a round head on the machine, or a chemical for the stain that water leaves behind. Muddy flags call for the head, and black spot calls for the bottle. The wider set is the [stone cleaner comparison](/hub/garden-supplies/stone-cleaner). Noted on 15 October 2026 from amazon.co.uk listings, with no lab test. A qualifying purchase can earn a commission at no extra cost to you.
You are looking at a green patio after a wet spring, with a pressure washer in the shed or a bottle still to buy.
You are looking at a green patio after a wet spring, with a pressure washer in the shed or a bottle still to buy. Patio cleaner vs pressure washer is that choice: a round head on the machine, or a chemical for the stain that water leaves behind. Muddy flags call for the head, and black spot calls for the bottle. The wider set is the stone cleaner comparison. Noted on 15 October 2026 from amazon.co.uk listings, with no lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Product type | Needs a machine | Main job | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Patio Black Spot Stone King restorer 2 L | Outdoor restorer | No | Algae and black lichen | 8.6 | about £29.99 | View offer |
| Preis-Tipp |  HG HG natural stone cleaner extra strong 1 L | Stone degreaser | No | Grease and old polish | 7.8 | about £11.18 | View offer |
| Alternative |  Nilfisk Nilfisk large patio cleaner | Washer patio head | Yes, Nilfisk washer | Flat patio wash | 8.0 | about £77.98 | View offer |
On this page
They solve different layers of dirt
A chemical and a jet wash clear different dirt. Loose soil, an algae film and mud shift with water if the flags and the pointing can take it. Black lichen often stays in the surface. Cement haze needs a film remover and a brush. An acid wash can rust-stain sandstone, and that colour does not rinse off. Floorseal notes that lichen resists pressure washing. Use water when the dirt brushes up as soil, and the bottle for black spot or cement bloom.
Lance versus a surface head
A lance and a surface head both need a pressure washer. London Stone keeps the wand about 50 cm off the patio at about 45 degrees, because a close, steep jet damages pointing and sealant. A round head holds the jets at one height and throws less water sideways, though it stripes the stone if you stop. Which? puts patio work at about 500-1200 psi. This head's 2,000 psi listing is a ceiling, not a slab setting.
The Nilfisk head in this set
The washer tool here is the Nilfisk large patio cleaner, about £77.98 on amazon.co.uk, rated 4.1 from 448 reviews. It is an attachment with no pressure washer in the box. The list names Premium, Excellent, Core and Compact machines, yet UK buyers say that list is still wrong for some washers. Which? often cites a patio cleaner around £50, and Nilfisk's mid cleaner at about £49.99 is a different product. If the coupling does not match, use a labelled chemical.
When the bottle is the better buy
Choose a labelled stone chemical for black spot, cement bloom, or indoor stone you must not blast. Refuse hydrochloric acid on Indian sandstone and black limestone: Pavingexpert shows an acid wash can rust-stain sandstone. A surface biocide is not a moss killer under UK plant-protection rules. The Health and Safety Executive's COPR guidance separates moss-control claims from surface biocides. Stone King has no coverage figure for flags. Outdoor sandstone, limestone and concrete are in the patio paving guide.
A conditional pick
Buy the large Nilfisk head if you already run a compatible Nilfisk and the flags are muddy. If you have no washer, do not buy the head alone. About £77.98 does not include the machine. Liquids for stains that are not mud are on the best stone cleaner page. Take the chemical first for black spot, cement haze, or stone you should not blast.
Common questions
Is a patio cleaner head better than a lance?
A head is better on open flags, because it holds the jets at one height and throws less water sideways. It is worse on steps and wherever you stop, since a stationary head still stripes the stone. One UK review put a head at about 20 m² an hour, against about four hours with a rotary lance. That is one owner's estimate, not a trial, and only if the head fits your washer.
Do I still need a chemical if I own a pressure washer?
Yes, when the mark is black lichen, cement bloom, or a stain water will not lift. The washer is the better first pass for loose soil, algae film and mud, if the stone and the joints can take it. The machine does not retire the bottle, and the bottle does not move soil. On soft, sealed or lichen-stained flags, patch-test a labelled cleaner before you raise the pressure.
Will the Nilfisk head fit my washer?
It is listed for Nilfisk Premium, Excellent, Core and Compact machines, and it is only an attachment. UK buyers report the compatibility list is still wrong for some washers. A Core 140 owner appears in the amazon.co.uk reviews, which does not prove every Core model will fit. Some people add a longer lance because the supplied one is short. Check the coupling before you pay about £77.98.
Why does my patio look striped?
The jets stayed on one line or one spot for too long. A lance does that when you tilt it or pause, and a round head does it when you stop walking. London Stone's distance is about 50 cm at about 45 degrees, so the jet does not dig out the joint. Keep to Which?'s 500-1200 psi patio band, not this head's 2,000 psi maximum, and keep moving.
Can a jet wash remove black spots?
A jet wash seldom removes black spots. They are often lichen in the stone, and Floorseal notes that the growth resists pressure washing. A higher setting, toward 2,000 psi, is more likely to scar the flag or empty the joint than to lift the mark. Treat one discreet slab with a labelled stone cleaner first. Use water on the loose soil around the stain, not as a cure for the spot.
Is a chemical safer than pressure on sandstone?
Only if the bottle is labelled for that stone and you have patch-tested a corner. Hydrochloric acid is a poor choice on Indian sandstone and black limestone. Pavingexpert shows an acid can mark stone and leave rust-coloured stains. A surface biocide is not a moss killer under plant-protection rules, so it is not a gentler way to clear soil or to treat plants at the patio edge.
Related pages
Sources
Public UK sources and manufacturer pages used for this comparison, last accessed 15 October 2026.
- London Stone — How to clean a natural stone patio (retrieved 15.10.2026)
- London Stone — How to jet wash a patio (retrieved 15.10.2026)
- Pavingexpert — Acid stains on paving (retrieved 15.10.2026)
- Historic England — Caring for monuments (retrieved 15.10.2026)
- Church of England — Churchyard wildlife and lichens (retrieved 15.10.2026)
- HSE — COPR biocide requirements (retrieved 15.10.2026)
- HSE — Cleaning products and the corrosive pictogram (retrieved 15.10.2026)
- HSE — Silica dust from scabbling or grinding (retrieved 15.10.2026)
- HG UK — Natural stone cement and grout film remover (retrieved 15.10.2026)
- HG UK — Natural stone cleaner shine restorer (retrieved 15.10.2026)
- HG UK — Natural stone cleaner extra strong (retrieved 15.10.2026)
- legislation.gov.uk — Consumer Rights Act 2015, section 9 (retrieved 15.10.2026)