Carbon tetrachloride in methanol is primarily used as a solvent in various chemical reactions and extraction processes. It is effective in dissolving non-polar compounds, making it useful in organic synthesis and laboratory research. The mixture is also employed in the purification and separation of substances, particularly in chromatography techniques. Additionally, it serves as a cleaning agent for removing oils, greases, and residues from industrial equipment and surfaces. However, due to its toxicity and environmental hazards, its use is strictly regulated and often replaced with safer alternatives in many applications.