diff --git a/jenkins_jobs/modules/scm.py b/jenkins_jobs/modules/scm.py
index cfed93315..a50145449 100644
--- a/jenkins_jobs/modules/scm.py
+++ b/jenkins_jobs/modules/scm.py
@@ -942,6 +942,9 @@ def repo(registry, xml_parent, data):
     :arg bool reset-first: Remove any commits that are not on the repositories
         by running the following command before anything else (default false):
         ``repo forall -c "git reset --hard"``
+    :arg bool clean-first: Remove any files that are not tracked in the repositories
+        by running the following command before anything else (default false):
+        ``repo forall -c "git clean -fdx"``
     :arg bool quiet: Make repo more quiet
         (default true)
     :arg bool force-sync: Continue sync even if a project fails to sync
@@ -968,6 +971,7 @@ def repo(registry, xml_parent, data):
         ("depth", "depth", 0),
         ("current-branch", "currentBranch", True),
         ("reset-first", "resetFirst", False),
+        ("clean-first", "cleanFirst", False),
         ("quiet", "quiet", True),
         ("force-sync", "forceSync", False),
         ("no-tags", "noTags", False),
diff --git a/tests/macros/fixtures/scm/multi-scms002.xml b/tests/macros/fixtures/scm/multi-scms002.xml
index ba788f916..174014ca6 100644
--- a/tests/macros/fixtures/scm/multi-scms002.xml
+++ b/tests/macros/fixtures/scm/multi-scms002.xml
@@ -16,6 +16,7 @@
         <depth>2</depth>
         <currentBranch>false</currentBranch>
         <resetFirst>false</resetFirst>
+        <cleanFirst>false</cleanFirst>
         <quiet>false</quiet>
         <forceSync>false</forceSync>
         <noTags>false</noTags>
diff --git a/tests/scm/fixtures/repo001.xml b/tests/scm/fixtures/repo001.xml
index 93204fb3d..275375902 100644
--- a/tests/scm/fixtures/repo001.xml
+++ b/tests/scm/fixtures/repo001.xml
@@ -6,6 +6,7 @@
     <depth>0</depth>
     <currentBranch>false</currentBranch>
     <resetFirst>true</resetFirst>
+    <cleanFirst>true</cleanFirst>
     <quiet>false</quiet>
     <forceSync>true</forceSync>
     <noTags>true</noTags>
diff --git a/tests/scm/fixtures/repo001.yaml b/tests/scm/fixtures/repo001.yaml
index cc503c7b3..165082b66 100644
--- a/tests/scm/fixtures/repo001.yaml
+++ b/tests/scm/fixtures/repo001.yaml
@@ -13,6 +13,7 @@ scm:
       jobs: 3
       current-branch: false
       reset-first: true
+      clean-first: true
       quiet: false
       force-sync: true
       no-tags: true