SUPER CONCENTRATED FORMULA: Our patio cleaner is super concentrated, making it the powerful formula you need to remove those stubborn bits of grime on your patio. Just one 5-litre bottle can cover up to 25m2! REMOVES STUBBORN BLACK SPOTS: Looking for a product to remove lichen from your patio and drive? Look no further! Pro-Kleen's Ultimate Patio Cleaner not only deeply cleans dirt and grime, but it removes stubborn black spots too SAFE FOR A VARIETY OF SURFACES: For your peace of mind, you can safely use our patio cleaner on patios, paths, Indian sandstone, block paving and more! SAFE FOR HOUSEHOLDS WITH PETS & CHILDREN ONCE DRIED: Once Pro-Kleen’s Ultimate Patio Cleaner has fully dried, your pets can safely be reintroduced to the area. Keep pets away from the area during application and whilst the surface is still wet HOW TO USE: Using a garden pump sprayer, apply the product directly to the area you’d like to clean and let the product sink in. The product will start to fizz as it sinks in. 2.For best results, leave the solution for 2-4 hours. 3.Once 2-4 hours have passed, rinse the area. For best results, use a pressure washer. Repeat the process on badly affected areas