Crikey Mikey Extra Strong is a potent solution designed to swiftly eliminate algae, lichen, and mould from various outdoor surfaces, including block paving, fences, walls, and patios. With visible results in just 12 hours, this industrial-strength formula outperforms other products, even when diluted, making outdoor maintenance efficient and effective. Neat application tackles stubborn areas, while dilution allows for routine maintenance. Packaged with 4 x 5 liters of Crikey Mikey Extra Strong and full instructions, it ensures comprehensive treatment for outdoor spaces.