In the processing plant in Sonsbeck, just across the German border, the waste oils enter a refining process. From the oil, a base oil is made that is suitable for producing lubricants. The waste coolant goes through a similar process resulting in a pure glycerol, which can be used to make new coolants. GS-Recycling produces DOT-4 certified brake fluid, which is highly popular with customers. The alcohols from the windscreen washer fluid are easily distilled and reused, for example in new windscreen washer fluid. Other fluids from the vehicle are also processed for repurposing, so that nothing is lost.