Best Patio Cleaners & Algae Removers UK 2026

Patio Magic! Concentrate - 2.5L

A biodegradable liquid concentrate that the manufacturer says kills green mould within 2–4 days, then keeps working on the surface for weeks afterwards. It's formulated as a fungicidal wash for patios, fencing and driveways, with results designed to last for months rather than days - the reason it's become something of a default recommendation for UK patios.

Wet & Forget Mould, Lichen & Algae Remover - 5L

No scrubbing, rinsing or jet washing: mix 1 part Wet & Forget with 5 parts water, apply, and walk away. One 5L bottle makes up to 30 litres of solution, covering an estimated 100–300m² depending on how soiled the surface is. Best applied in cloudy, dry conditions with 4–5 hours before rain is forecast.

Patio Blast Cleaner Fluid - Algae, Moss & Mould Remover, 5L

Another spray-and-leave formula, covering up to 220m² per bottle according to the manufacturer, with a claimed protection window of up to 9 months against moss, lichens and black spot. Aimed at patios, paths and decking where you'd rather not revisit the job every season.

PatioXpert Spray & Leave Path & Patio Cleaner Concentrate - 5L

Rather than an instant wash-off, this one is designed to work gradually, letting natural weathering from rain, sun and wind do the job over time. No scrubbing or rinsing required, and it's pitched across patios, decking, paving and driveways rather than one surface type.

Monty Miracle Complete Outdoor Cleaner

A genuinely fast-acting alternative to the usual 2–12 week wait: apply, agitate, wait 6–10 minutes, then rinse with a soft bristle brush and garden hose. No pressure washer needed, and the manufacturer markets the formula as pet- and child-safe once dry - worth double-checking the label for your own household before use.

Neudorff Fast Acting Algae and Moss Killer Concentrate - 1L

Removes green build-up and algae from paths, driveways and patios, with one litre said to cover up to 180m². Positioned as fast-acting with visible results within a day, and manufacturer-claimed long-lasting effects after that initial treatment.

Zep Green Algae Remover Spray - 1L

A ready-to-use spray with no mixing or dilution needed - just spray and go. Aimed at removing green algae deposits from stone, cement, glass and ceramic tiles, which makes it a sensible pick for smaller patios, paths and terraces rather than a full driveway.

Resolva Moss Killer Spray - 1L x 2

Manufacturer-claimed results in 24 hours, applied via a non-drip trigger for precise application. Built specifically with permeable surfaces in mind - block paving, gravel and decking - where run-off matters, with each litre said to treat up to 10m².

Jarder Block Paving Cleaner - 5L, Restores Colour

Purpose-built for block paving rather than general patio surfaces, targeting the black spot, dirt, grime and mould that build up specifically between the blocks. It's also pitched at preventing the algae and moss growth between paving joints that can, over time, crack the grout and flags.

SmartSeal Drive Cleaner Xtreme - 2 x 5L, Block Paving & Black Spot Remover

A fast-acting formula aimed at rapid removal of ingrained dirt, grime, lichen and green algae from driveways, paths and patios. Works across block paving, concrete, natural stone and brick, and the twin-pack format suits a full driveway rather than a small patio corner.

Pro-Kleen Patio & Driveway Cleaner - 20L

Marketed as an extremely powerful formula built for deeply neglected patios and driveways, cutting through the stubborn dirt and grime that lighter cleaners struggle with. Works on block paving, concrete flags, steps and paths, applied with a watering can or pump sprayer - the supplier notes it isn't suitable for tarmac, and the 20L size reflects that it's built for a big, overdue job rather than routine upkeep.

Ronseal Patio & Block Paving Cleaner Protect - 5L

This Ronseal Thompson's formula is designed to kill moss, mould and algae on most garden surfaces, with active ingredients aimed at lifting dirt and grime to revive and brighten the finish. Straightforward to use, and from a brand most UK gardeners already know from other outdoor treatments - a safe default if you'd rather not research a less familiar name.

Algon Organic Path & Patio Cleaner - 2.5L

A genuinely organic formula the manufacturer markets as safe for children, pets and wildlife once applied, with no need to rinse off afterwards. One 2.5L bottle is said to cover around 60m² with a garden sprayer, with results showing within days and lasting around a year - the longest claimed duration of any product in this roundup.

Block Blitz Paving Eco Cleaner - 6 Pouches

A different format to the usual liquid concentrate: mix each pouch with water for a barrier detergent the maker describes as containing no acid, bleach or biocides. It's said to repel around 90% of weeds and 99% of moss and algae for up to 6 months, covering roughly 30m² across the six-pouch pack.

EASYCare Patio & Deck Cleaner Concentrate - Acid-Free, 1L

Developed specifically with natural stone in mind - limestone, sandstone, marble and granite - as well as patios, decking and concrete, this is a strong but acid-free formula, which matters because acidic cleaners can etch or dull polished natural stone over repeated use. Once applied, the manufacturer says it keeps working for up to 12 months rather than needing repeat treatments.

Kärcher Terrace Cleaner Concentrate RM 564

Designed for gentle cleaning of driveways, patios and decking made of both wood and stone - dissolving oil, grease, mineral soiling and green coatings without being harsh on the material underneath. It's a low-foaming, biodegradable formula that dilutes from 500ml up to 5 litres of cleaning liquid, useful if you have mixed surfaces around the same patio.

Doff Super Concentrate Path, Patio and Decking Cleaner - 2.5L

A disinfectant-strength concentrate aimed at removing dirt, mould, algae and mildew from driveways, fencing and patios alike. Dilute 1 part cleaner to 4 parts water, apply with a garden sprayer or watering can, then leave it to work.

Jeyes Fluid Classic Outdoor Cleaner 5L - Makes 100L

A heavy-duty disinfectant concentrate diluted at 20:1, so a single 5L bottle stretches to 100 litres of cleaning solution - the best yield-per-litre in this whole roundup. The maker states it kills 99.9% of bacteria and viruses on patios, driveways and paths, and it's DEFRA-approved against avian influenza, which is relevant if you keep chickens or wild birds visit your garden.

HG Algae & Mould Remover - Concentrated Patio & Path Cleaner

A high-performance biocide the manufacturer says kills and removes algae, mould, lichen and fungus, and describes as stone-safe for use on paving slabs and outdoor areas. It's positioned as genuinely multi-surface - stone, concrete, masonry, tiles, roofs, walls and fences - rather than a patio-only product.

Spear & Jackson Moss Gone Moss Killer - 5L with Long Hose Trigger

A ready-to-use acetic acid formulation (MAPP 20068) that the manufacturer says works within 24 hours on paths, patios, roofs, walls, tarmac and gravel, effective all year round. A long hose trigger spray is included, so there's no decanting into a separate sprayer before you start.

Jim Fellows - Garden Machinery Specialist

Jim covers garden and outdoor maintenance products for Garden-Review, researching manufacturer specifications and cross-referencing customer feedback to help UK gardeners choose the right tool or treatment for their space.