It was part of the German response to the Soviet Zhitomir-Berdichev offensive. So whilst 'cleaning' may have been appropriate I think it is usual for these things to be slightly less literal.
The operation name is also the name of an influential piece of classical music.
@Richtig: Could you please provide a source for this information? I`d like to add the code name at the "Lexikon der Wehrmacht". They have already a comprehensive collection of "Decknamen":