diff --git a/Jenkins/daily-cleanup/Jenkinsfile b/Jenkins/daily-cleanup/Jenkinsfile
new file mode 100644
index 0000000..09a4618
--- /dev/null
+++ b/Jenkins/daily-cleanup/Jenkinsfile
@@ -0,0 +1,55 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://llvm.org/LICENSE.txt
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/* Pipeline executed daily to do cleanup work */
+
+def success = true
+def failure_message = ""
+
+pipeline {
+    agent { label 'linux' }
+     triggers {
+        cron('@daily')
+    }
+    environment {
+            SCRIPT_DIR = "${WORKSPACE}/llvm-premerge-checks/scripts"
+    }
+    options {
+        timeout(time:10, unit:'MINUTES')
+    }
+    stages {
+        stage("git checkout"){
+            steps {
+                dir("${LLVM_DIR}"){
+                  git url: 'git@github.com:llvm-premerge-tests/llvm-project.git'
+                }
+                dir("llvm-premerge-checks")
+                {
+                    git url: 'https://github.com/google/llvm-premerge-checks.git'
+                }
+            }
+        }
+        stage('cleanup repo'){
+            // delete old branches after 30 days
+            steps {
+                dir("${LLVM_DIR}"){
+                  sh """
+                    python ${SCRIPT_DIR}/cleanup_branches.py --days 30 --pattern "phab-diff-.*"
+                  """
+                 }
+            }
+        }
+    }
+}
diff --git a/scripts/cleanup_branches.py b/scripts/cleanup_branches.py
new file mode 100644
index 0000000..655ad3b
--- /dev/null
+++ b/scripts/cleanup_branches.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+# Copyright 2020 Google LLC
+#
+# Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://llvm.org/LICENSE.txt
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""The script will delete old git branches."""
+
+import argparse
+import datetime
+import functools
+import git
+import operator
+import os
+import re
+from typing import List
+
+
+def delete_old_branches(repo_path: str, max_age: datetime.datetime, branch_patterns: List[re.Pattern],
+                        *, dry_run: bool = True, remote_name: str = 'origin'):
+    """Deletes 'old' branches from a git repo.
+
+    This script assumes that $repo_path contains a current checkout of the repository ot be cleaned up.
+    """
+    repo = git.Repo(repo_path)
+    refs = repo.remotes[remote_name].refs
+    print('Found {} references at {} in total.'.format(len(refs), remote_name))
+    del_count = 0
+    for reference in refs:
+        committed_date = datetime.datetime.fromtimestamp(reference.commit.committed_date)
+        if committed_date < max_age and _has_pattern_match(reference.name, branch_patterns):
+            if dry_run:
+                print('dryrun: would have deleted {}'.format(reference.name))
+            else:
+                print('Deleting {}'.format(reference.name))
+                git.RemoteReference.delete(repo.remotes[remote_name].repo, reference)
+                del_count += 1
+
+    print('Deleted {} references.'.format(del_count))
+    if not dry_run:
+        print('Pushing to remote...')
+        repo.remotes[remote_name].push()
+    print('Done.')
+
+
+def _has_pattern_match(name: str, patterns) -> bool:
+    """Check if name matches any of the patterns"""
+    return functools.reduce(
+        operator.or_,
+        map(lambda r: r.search(name) is not None, patterns),
+        False)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Clean a git repository')
+    parser.add_argument('repo_path', type=str, nargs='?', default=os.getcwd())
+    parser.add_argument('--days', type=int, default=30)
+    parser.add_argument('--pattern', action='append', type=str)
+    parser.add_argument('--dryrun', action='store_true')
+    args = parser.parse_args()
+
+    max_age = datetime.datetime.now() - datetime.timedelta(days=args.days)
+    branch_pattern = [re.compile(r) for r in args.pattern]
+    delete_old_branches(args.repo_path, max_age, branch_pattern, dry_run=args.dryrun)