I was hoping that

                    jobDsl targets: ['jobs/*.groovy', 'config-files/*.groovy', 'views/*.groovy'].join('\n'),
                        removedJobAction: 'DELETE',
                        removedViewAction: 'DELETE',
                        removedConfigFilesAction: 'DELETE',
                        lookupStrategy: 'JENKINS_ROOT',
                        unstableOnDeprecation: true,
                        failOnMissingPlugin: true

would also delete all jobs not managed by job-dsl - unfortunate its not. If job-dsl would have an option to remove everything it does not know about (jobs, configFiles, views) then keeping the environment cleaner would be a lot easier. Our organization could define a rule saying: 'all our items must be created via job-dsl and be reproducible everything else will be deleted.

Therefore I ask for a feature to enforce job-dsl to only keep items it knows about.