A fast acting, high performance patio cleaning product, with four powerful active ingredients. Patio Clean Xtreme offers the simple way to keep any patio clean often avoiding the need for pressure washing. It is important the patio remains wet throughout during 60 minute period, as the product becomes inactive once dry. Most ingrained organic matter and grime will be removed after one application, but sometimes a second application may be required to remove all black and white spot algae. Instructions for Use - Application Guide; 1. Sweep away loose debris & areas with a heavy build-up of dirt & grime. 2.Wet surface area with water. 3. Dilute Xtreme at a ratio of 1:1. If removing black spot, don't dilute. 4. Apply product to surface using a watering can or sprayer. 5. Make sure that surface area doesn't dry out before rinsing off. 6. Leave on surface area for upto 60 minutes. 7. Rinse area with water.