How to Clean Artificial Grass and Keep It Looking New
Updated: Oct 9
Clean artificial grass by clearing leaves and debris, brushing against the pile with a stiff synthetic brush, and rinsing with a hose. Pet areas need a quick rinse after use and an enzyme cleaner now and then. That covers almost everything on a well-built lawn. The jobs below come up a few times a year, and most of the problems people try to clean away (smells, weeds from below, puddles) trace back to how the artificial grass installation was built.
What you need
A short kit list does the whole job:
A stiff brush with synthetic bristles (never metal)
A plastic rake or a leaf blower
A garden hose
Mild washing-up liquid and warm water for spills
An enzyme cleaner made for artificial grass, if you have pets
A bag of kiln-dried sand to top up infill
Weekly to monthly: the routine
Clear debris. Leaves, twigs, blossom and soil are the main enemy. Left on the surface they hold moisture, rot down into a thin layer of compost in the pile, and give moss and weed seeds somewhere to grow. A leaf blower or plastic rake clears them quickly; a metal rake can catch the backing.
Brush against the pile. Brushing stands the fibres back up where they have been walked flat, works the infill back down between them and stops debris settling. Use steady strokes against the direction the fibres lean, and brush when the grass is dry. Every few weeks is enough for most gardens, more often on the paths people actually walk.
Rinse. A hose down washes away dust and pollen and freshens the surface. In hot weather it also cools the grass, which can get uncomfortably warm in full sun.
Moss and algae
Moss on artificial grass grows in the debris on top, not up through a properly laid lawn. It turns up in the same places every year: shady, north-facing corners, under trees, and patches that stay damp because leaves sit on them or drainage is slow.
To clear it, brush out as much as you can, then treat what is left with a moss and algae treatment that says it is suitable for artificial grass, following the label and not overdoing it. Rinse well afterwards. The longer-term fix is removing what lets it grow: clear debris more often in autumn, cut back overhanging branches if you can, and look at drainage if a patch stays wet days after rain.
Weeds in artificial grass
Weeds appear in two places, and each has a different cause.
In the middle of the lawn: These are almost always seeds that blew in and rooted in debris on the surface. Pull them by hand and brush more regularly; they have very shallow roots.
Around the edges: A gap between the grass and the edging, or a lawn laid without a proper membrane and edge, lets weeds come up from the soil. Pull them, then check the perimeter is fixed tight against a solid artificial grass edging such as timber, steel or paving. If they keep coming through the middle from below, the base was built without a membrane or with too little stone, and that is a relaying problem rather than a cleaning one.
If you use a weedkiller, choose one that is safe for synthetic surfaces and keep it off surrounding plants.
Cleaning up after pets
Pick up solids as soon as you can, then rinse the spot. Urine needs water to carry it down through the backing and base; the compounds in it do not simply disappear with rain. Rinse the areas your dog uses most a few times a week in warm weather, and use an enzyme cleaner on favourite spots every few weeks: it breaks down the cause of the smell instead of masking it.
A lawn that still smells after regular rinsing has a drainage problem underneath. The fibres are not the issue; urine is sitting in the backing or the base. A lawn for pet owners should be built on a free-draining base for exactly that reason.
Stains and spills
Most spills come off with warm water and a little washing-up liquid on a soft cloth or sponge, then a rinse. Deal with them while they are fresh.
Food, drink, sauces: Soapy water, then rinse.
Oil, paint, or anything solvent-based: Blot it, do not rub it in, and use only a cleaner the grass manufacturer approves. Solvents can melt or discolour the fibres.
What not to use on artificial grass
A few things cause permanent damage:
Bleach, ammonia and strong household chemicals. They can discolour the fibres and degrade the backing.
A pressure washer up close. High pressure can blast out infill and lift fibres. If you use one, keep the pressure low and the lance well away from the surface.
Metal rakes and stiff wire brushes. They pull fibres and catch the backing.
Heat. Barbecues, fire pits, dropped embers and cigarettes melt the fibres and leave a permanent mark.
Reflected sunlight. Strong sun reflected from some windows or glass can concentrate enough heat to mark the grass.
Once a year: the deep clean
Late autumn or early spring is a good time for a thorough going over:
Clear every leaf and bit of debris, including from the edges and corners.
Brush the whole lawn hard against the pile.
Treat any moss or algae patches.
Rinse thoroughly.
Top up kiln-dried sand where the lawn looks flat or the backing shows, then brush it in.
Walk the edges and joins and re-fix anything lifting.
Artificial grass maintenance questions, answered
Does artificial grass need watering?
No, only rinsing to clean it or cool it on hot days.
How long does well-kept artificial grass last?
Typically 15-20 years or more when it was laid on a proper base and is brushed and cleaned regularly.
We lay lawns around Wolverhampton and the Black Country with the base and edges built so that cleaning stays this simple. If you are planning a lawn or want a worn one replaced, the best time of year to install artificial grass is any time the ground is workable.
