Spray & Leave Formula, No Scrubbing Needed - Powerful spray & leave patio cleaner designed to work gradually over time. Simply apply and allow natural weathering such as rain, sun and wind to do the work. No scrubbing or rinsing required. Works Gradually for Long-Lasting Cleanliness - Unlike instant wash-off products, this outdoor cleaner continues working after application, helping lift algae marks and mould staining while helping to reduce regrowth over time. Concentrated Formula, Large Area Coverage - Highly concentrated solution dilutes up to 1:5, providing coverage of up to 60m², 150m² or 300m² depending on pack size and surface type. Excellent value for small and large outdoor areas. Effective on Algae & Mould Stains - Designed to tackle green algae, mould staining and surface build-up on patios, paths, driveways, paving and other outdoor hard surfaces when used as directed. Apply in Dry Conditions for Best Results - Apply to a dry surface in dry weather. Do not apply if rain is forecast within 4-5 hours. Heavily affected areas may benefit from a second application after several weeks.