Patent ID: 7288511

Claim:
A method of cleaning a solid surface which comprises treating said surface with a cleaning composition comprising greater than about 50 weight percent of a dichioroethylene (I) and one or more alkoxy-substituted perfluoro compounds that contain six carbon atoms (HFE6C) of the formula (II) R 1 —O—R 2 where R 1 is perfluorobutyl and R 2 is ethyl, or R 1 is perfluoropentyl and R 2 is methyl, or mixtures thereof, and an additive selected from the group consisting of: (A) a highly fluorinated compound of the formula C a F b H c X d where a is an integer from 2 to 8, b is an integer greater than a but less than 2a+2, d is 0, 1, or 2, and c is less than or equal to 2a+2−b−d and X is O, N, halogen, or Si, and combinations thereof; (B) an enhancement agent selected from the group consisting of alcohols, esters, ethers, cyclic ethers, ketones, alkanes, aromatics, amines, siloxanes, terpenes, dibasic esters, glycol ethers, pyrrolidones, low or non-ozone depleting halogenated hydrocarbons, and mixtures thereof; and (C) mixtures thereof.