To skip running the cleanup for a particular project, set the skip property to true.
<build> [...] <plugin> <artifactId>maven-clean-plugin</artifactId> <version>2.6.1</version> <configuration> <skip>true</skip> </configuration> </plugin> [...] </build>
You can also skip the cleaning via command line by executing the following command:
mvn clean -Dclean.skip=true