Clean-up refers to the proper disposal and handling of art materials, particularly paints and solvents. This includes techniques for cleaning brushes, palettes, and surfaces, as well as methods for minimizing waste and reducing the environmental impact of art practices. Golden Artist Colors emphasizes the importance of responsible clean-up procedures, such as using liquid solutions instead of dry powders, filtering wastewater, and disposing of hazardous materials properly. The company also promotes environmentally friendly practices, such as using solvent-free brush cleaning options and reducing the amount of solvent used in oil painting. Additionally, Golden Artist Colors encourages artists to adopt sustainable practices, such as recycling materials and minimizing packaging waste. (Source IDs: none specifically, but rather a general summary of the provided articles)