diff --git a/src/Controller/APIController.php b/src/Controller/APIController.php
index 4fd4e30e..66500409 100644
--- a/src/Controller/APIController.php
+++ b/src/Controller/APIController.php
@@ -4033,12 +4033,20 @@ class APIController extends Controller implements LoggedController
                 $warr->setVehicle($vehicle);
         }
 
+        // TODO: make a standard clean plate number service
+        // clean plate number
+        $plate = $req->request->get('plate_number');
+        // upper case and remove spaces
+        $plate = strtoupper(str_replace(' ', '', $plate));
+        // remove special characters
+        $plate = preg_replace('/[^A-Za-z0-9. -]/', '', $plate);
+
         // create or update warranty entry
         $warr->setSerial($serial)
             ->setFirstName($req->request->get('first_name'))
             ->setLastName($req->request->get('last_name'))
             ->setEmail($req->request->get('email'))
-            ->setPlateNumber($req->request->get('plate_number'))
+            ->setPlateNumber($plate)
             // TODO: figure out how to compute date of purchase
             ->setDatePurchase($date_pur)
             // TODO: set status