Wet & Forget Mould, Lichen & Algae Remover, Outdoor Patio Cleaner, Black Spot Remover, Bleach Free, 5LNo Scrubbing Required: Simply mix 1 part Wet & Forget with 5 parts water, apply to the desired surface, and let it work its magic. No scrubbing, rinsing or jet washing required, just spray and walk away Highly Concentrated Formula: One bottle produces up to 30 litres of solution, covering a large area of 100 300m. Apply in cloudy, dry conditions for best results, ensuring at least 4 5 hours before any rainfall Versatile Application: Perfect for