Most homeowners ask how to clean a patio. The better question is when to clean a patio, because the timing decides whether the result lasts a season or three.
The argument runs against received wisdom. Most people clean in autumn after the leaves have come down. We’d rather do it in spring, and so would the patio.
When to clean a patio if you only do it once
Spring patio cleaning is the answer if you only do it once a year. Late April or early May, ideally. Three reasons.
The first is algae growth cycle. Algae spores germinate in damp shaded surfaces from March onwards. A clean before they establish kills them before they have a chance to spread. An autumn clean kills the colony that has already had six months to dig in, and a fresh wave starts the following spring.
The second is sun. UV light is the enemy of algae regrowth. A patio cleaned in spring gets four to six months of sun to keep it suppressed. A patio cleaned in October gets six weeks of fading sun before the wet winter sets the algae running again.
The third is safety. The slippery period for most North Yorkshire patios is November through February. If you clean in spring, the patio is at its safest going into summer when it gets used most.
Why spring beats autumn even if you can clean twice
If you have a second clean in you for the year, do it in late September or early October to clear leaf litter and any moss build-up before winter. That’s a tidy, not a treatment. The biocide work happens in spring.
The order matters. Spring is when the chemistry does its job. Autumn is when you sweep the floor.
What a patio clean involves on a Thirsk patio
Most patios across Thirsk and Sowerby are Yorkshire stone, sandstone, or concrete slab. The method is the same.
We pre-treat with a biocide that kills algae at the spore level, leave it to work, then soft wash or rotary wash depending on the surface. Yorkshire stone and natural sandstone take a softer approach because pressure on a sandstone surface opens up the grain and gives next year’s algae something to grip to. Concrete and porcelain take a firmer wash.
The patio cleaning service page walks through the equipment and the chemistry if you want the detailed version.
What it typically costs
For a standard rear patio on a Thirsk or Sowerby semi (around 25 to 40 square metres), the bracket is usually £180 to £280 for a full clean including the biocide pre-treat and the gutter rinse afterwards.
Bigger gardens, raised patios with steps, or jobs that need the joints repointed are quoted on the day.
We cover Thirsk and the surrounding villages, so the call-out is local and there’s no national-company surcharge.
A small warning about jet washing yourself
Every spring we get calls from homeowners whose patios came up patchy after a DIY pressure wash. The usual cause is uneven nozzle distance, which leaves zebra stripes on the slabs. The other cause is washing off the grout in the joints, which then need repointing.
Soft wash chemistry and a rotary attachment avoid both problems. They cost more than hiring a jet wash