'To make sure weeds do not return, you need to make sure there are no remaining seeds or roots in the soil,' Rowan says. 'The easiest way is to create a solution using a mix of soap, vinegar, and salt.'
'The salt helps to prevent the weeds growing back,' explains Jason Wilkinson, Qwickhose. 'And white vinegar draws moisture out of the plants overnight. Leave your solution overnight, then in the morning scrub your patio with a stiff-bristled brush and then wash off the residue with a garden hose.'
The powerful ingredients of vinegar and salt should permanently kill any weeds growing on your patio, but if you do notice some coming back, you can invest in a specialist weed killer instead.