Pouring boiling water directly onto moss growing on driveways or patios can kill it within minutes, and the surface can be clean in as little as 24 hours, according to Stefan Gheorghe from Home Edit. The method is described as “surprisingly fast” and needs no pressure washer or chemical sprays.
Moss thrives in autumn because of rainy, cold conditions and the abundance of fallen leaves, which trap moisture on stone surfaces. If left untreated, moss can spread, become hard to clean, and create a slippery tripping hazard.
Why Boiling Water Works
Gheorghe said: “Boiling water produced the most immediate visible result. I poured freshly boiled water directly onto the moss growing in the joints between the pavers. The reaction was instant. The moss collapsed and darkened within minutes.”
The intense heat damages the plant's cells, and because moss grows in a thin layer, the water easily penetrates and dries it out, turning it brown. Unlike pressure washers, which can remove sand or jointing material that holds paving slabs together, boiling water is gentle on the surface. Baking soda can also dry out moss, but it takes longer and may need repeated applications over several days.
How to Clean a Mossy Patio or Driveway
Start by sweeping the area with a broom to loosen the moss. Then carry a freshly boiled kettle outside—this may require several trips for larger areas, so a large heatproof bucket can be more practical. Pour the hot water slowly and directly over the mossy patches, keeping control to avoid splashback.
The moss should start to wilt immediately. After a few hours or by the next day, it should be completely dead. Rinse the surface with a bucket of water or a hose to remove any remaining dirt, and the moss will be gone with minimal effort.
