FIELD: industrial chemistry. SUBSTANCE: tertiary partially fluorinated alkanes of general formula: $$$ wherein each of R is the same or different and selected from group consisting of $$$, and $$$ is alkyl or fluoroalkyl group containing 1 to 6 carbon atoms provided that when each of R is $$$, $$$ is not $$$, and provided that said compound is not $$$. Said alkanes are used as solvents in various variants of industrial cleaning of solid surface. Said purification includes cold cleaning, dry cleaning and removal of flux from printed circuits. EFFECT: more efficient cleaning method. 8 cl, 1 tbl
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