If possible, please Remove coarse contaminants in advance. Depending on the intensity of the dirt, use the CleanPrince roof tile cleaner Dilute 1:2 to 1:10 with clear water and on the dry roof pour on. The more contamination, the less dilution. Rework with a scrubber, brush or high-pressure cleaner is not necessary. In the 24-hour exposure time should it not rain, otherwise repeat the process. After 24 hours, the next rain can simply wash away the dissolved contaminants. Coarse contaminants must be removed with the help of a water jet. Sensitive surfaces such as zinc or copper gutters are not attacked. Safety instructions: This product is subject to the Biocidal Products Regulation (EU) No. 528/2012. Use biocidal products carefully. Always read label and product information before use. Di.