Why it makes such a difference
Algae, moss and traffic grime build up slowly, so most people do not notice how dark a patio has become until half of it is clean. A professional wash takes most surfaces back to the colour they were when they were laid, and it removes the slippery green film that makes steps and decking dangerous in winter.
Surface by surface
Block paving: washed with a surface cleaner, then the joints are re-sanded so the blocks stay locked in. Indian sandstone and York stone: lower pressure and a wider fan so the surface is not pitted. Concrete slabs and crazy paving: the most forgiving; a surface cleaner leaves an even finish. Timber decking: low pressure along the grain, then a day to dry before any oil or stain. Brick walls and steps: gentle pressure to protect the mortar.
What we need from you
An outside tap or an accessible indoor tap, and the patio cleared of furniture and pots. We bring the machine, hoses, surface cleaner and brushes, and we sweep and tidy before we leave. Expect some spray on nearby windows, which we rinse down.
Cost and timing
Pressure washing is £60 per hour. A typical patio is one to two hours; a long driveway or large terrace can be half a day. Spring is the best time so the surfaces are clean for summer; shaded areas may need a second wash in autumn.
Keeping it clean
Sweep leaves off regularly, keep pots on feet so water does not sit under them, and ask about a sealer for block paving or sandstone, which slows the return of algae and makes the next clean faster.