Maven force clean (remove)

Question

How can I tell Maven to remove dir/file forcefully? (I can manually delete it just fine, sometimes Maven works, sometimes not, seems 50/50)

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-clean-plugin</artifactId>
                <version>2.4.1</version>
                <configuration>
                    <filesets>
                        <fileset>
                            <directory>src/main/webapp/form-src/node_modules</directory>
                            <includes>
                                <include>**</include>
                            </includes>
                        </fileset>
                    </filesets>
                </configuration>
            </plugin>