Resolva Xtra Clean Concentrated Cleaner is four times more powerful than its predecessor and is easy to dilute in a watering can or sprayer. It promises long-lasting results for up to nine months and removes 100% of algae, green mould and lichen from paths and patios, and can also be used on different surfaces, including fencing, decking, walls, facades, paving and even artificial grass. This antibacterial, anti-fungi formula can also be used to prepare surfaces ready for painting or staining, and does not change the appearance of treated materials. It is biodegradable, does not contain bleach or acids and children and pets need not be excluded from treated areas once dry. Simply apply and leave, with no need for scrubbing or rinsing. 2.5L