The invention relates to a method for cleaning liquid-carrying lines (1), wherein the line (1) is cleaned in a cleaning section (2) between two line branches (3, 4), one of the line branches being a supply branch (3) through which Means or media for flushing out impurities (5) located in the line (1) are supplied, and a line branch is a flushing branch (4) through which the impurities (5) are flushed out, in a section of the line (1), seen from the cleaning section (2) beyond the rinsing branch (4), a radially expandable closure bladder (6) is radially expanded, the impurities (5) are rinsed out by the rinsing branch (4) and the closure bladder (6) is de-expanded. Furthermore, the invention relates to a corresponding system for performing the method.
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