A first objective of the project is to provide an overview of the various preventive methods (design, add filling material, type hardening ...) and curative methods (fires, warm air, stommbehandeling, IR, high pressure cleaning, wiping, brushing, ...) to manage and clean surfaces weed (higher plants, mosses, lichens) in relation to their efficiency, cost and environmental impact. It is anticipated that a combination of preventive and curative methods have a better and cheaper long-term effect. With an inventory of existing surfaces and division into classes of 'weed growth' 'this will lead to guidelines to achieve an environmentally friendly and economical surface treatment against weeds and dirt, but also an awareness of the manager to come to acceptable weed growth in relation to the overall scene. A second object is to pleke small-scale treatment of contaminants by hydrocarbons (HC) to radiation (such as parking lots, bad luck strips and ordinary radiation treatment).