Carbon tetrachloride in methanol is primarily used as a solvent in various chemical reactions and processes. It is effective in dissolving a wide range of organic compounds, making it useful in laboratory settings for extraction and purification purposes. Additionally, this mixture is employed in the synthesis of certain chemicals and pharmaceuticals, where it acts as a medium to facilitate reactions. In industrial applications, it is sometimes used for cleaning and degreasing metal surfaces due to its ability to remove oils and greases effectively. However, its use has declined in many areas due to environmental and health concerns associated with carbon tetrachloride.