As temperatures rise, many homeowners are turning their attention to patios and driveways that have accumulated dirt, algae, and moss over winter. While pressure washers are a common choice, patio specialist Bill Jarvis from Premium Paints warns they can cause unseen damage.
Jarvis explains that pressure washers can strip the surface layer from paving materials and remove sand between slabs, leading to uneven patios and conditions that encourage weeds and moss to return. Instead, he recommends biological washing powder, a budget-friendly alternative costing just £3.35 per box at Waitrose.
The enzymes in biological detergents are formulated to break down organic matter such as grease, food residue, and—crucially—algae, moss, and grime. Jarvis notes that this method is kinder to common paving surfaces like concrete slabs and block paving.
To use, fill a bucket with warm water and add one scoop of biological washing powder. Apply the solution to the patio and leave it for 20 to 30 minutes. Then scrub with a stiff outdoor brush and rinse with a garden hose. Jarvis emphasises that allowing the detergent time to sit is key, as the enzymes start breaking down dirt before scrubbing.
For persistent marks, Jarvis suggests repeating the detergent application rather than resorting to vigorous pressure washing. He advises that two gentler cleans are usually better for a patio than one harsh treatment.
