The selection of solvents for cleaning is very important. A solvent that evaporates too rapidly may lower the surface temperature of the metal to below the dew point of the surrounding air, and moisture will condense on the surface. This is especially important in summer months where the dew point and temperature spread is only a few degrees. For this reason, dimethylformamid (DMF) and methylene chloride (MC) are suitable solvents in area of polyurethane industry. Wax-based release agents may be removed from the part before painting by a conventional degreasing solvent, but silicone oils are difficult to remove and will interfere with the paint coating.