If your Cheltenham patio has turned green, the first thing I'd tell you is to brush it regularly. That stops moss and algae getting a hold. They won't harm the paving, but they make patios, paths and steps slippery. Where growth has already settled in, a stiff broom or wire brush will shift it.
Green growth spreads fastest in shady spots with poor air flow, and it comes back if nothing changes. Cutting back overhanging plants helps. After rain, watch for puddles. A patio should slope slightly so water runs off. Keeping nearby drains clear helps too.
For weeds, I run a weeding knife along the joints to cut them off at the root. Pulling them often disturbs the jointing sand, so refill the gaps once the surface is clean. Before pressure washing, sweep well so loose grit can't scratch the surface. Test a small area at low pressure, never go above medium, and wear goggles. Blast out the sand or mortar between slabs and the weeds come straight back. Try any patio cleaner on a small patch first, as some contain acid that can mark natural stone.
Catching it early keeps steps safe underfoot, and full joints keep paving strong. If water keeps sitting on the surface, or the green returns whatever you do, that's the time to call. I'm Rousit at Alpha Renovations Ltd, and I do landscaping across Cheltenham. Get in touch through my Landscaping page and I'll come and look at yours.
