Why do the paving stones have dark patches?
This is due to differential weathering, where the surface of the paving has cured at different rates, causing darker colour variation on the paving. Generally this is exaggerated by the presence of efflorescence which, once removed, will reduce the effect of the dark patches. As with efflorescence the dark patches will generally disappear with time. Can I use a pressure washer to clean my patio? Yes but, as always, follow the manufacturer’s instructions carefully. Do not pressure wash your patio too strongly or too frequently as you may damage the surface of the paving. How often should I clean my patio? Regular washing and brushing should be adequate to maintain your patio in pristine condition. However, you may wish to clean your patio using a proprietary cleaner. This can enhance its appearance but it may affect long term durability and should only be used sparingly (only two or three times during the lifetime of the paving). Consult your paving supplier for advice and a suitable cl
