diff --git a/admin/cleanDemo.php b/admin/cleanDemo.php
new file mode 100644
index 0000000..cc6a567
--- /dev/null
+++ b/admin/cleanDemo.php
@@ -0,0 +1,30 @@
+<?php
+/**
+ * This software is governed by the CeCILL-B license. If a copy of this license
+ * is not distributed with this file, you can obtain one at
+ * http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt
+ *
+ * Authors of STUdS (initial project): Guilhem BORGHESI (borghesi@unistra.fr) and Raphaël DROZ
+ * Authors of Framadate/OpenSondage: Framasoft (https://github.com/framasoft)
+ *
+ * =============================
+ *
+ * Ce logiciel est régi par la licence CeCILL-B. Si une copie de cette licence
+ * ne se trouve pas avec ce fichier vous pouvez l'obtenir sur
+ * http://www.cecill.info/licences/Licence_CeCILL-B_V1-fr.txt
+ *
+ * Auteurs de STUdS (projet initial) : Guilhem BORGHESI (borghesi@unistra.fr) et Raphaël DROZ
+ * Auteurs de Framadate/OpenSondage : Framasoft (https://github.com/framasoft)
+ */
+
+use Framadate\Services\LogService;
+use Framadate\Services\PurgeService;
+
+include_once __DIR__ . '/../app/inc/init.php';
+
+$logService = new LogService();
+$purgeService = new PurgeService($connect, $logService);
+
+$purgeService->cleanDemoPoll();
+
+
diff --git a/app/classes/Framadate/Repositories/VoteRepository.php b/app/classes/Framadate/Repositories/VoteRepository.php
index cbbbd77..f015162 100644
--- a/app/classes/Framadate/Repositories/VoteRepository.php
+++ b/app/classes/Framadate/Repositories/VoteRepository.php
@@ -41,7 +41,13 @@ class VoteRepository extends AbstractRepository {
 
         return $prepared->execute([$poll_id, $vote_id]);
     }
+    
+    public function deleteOldVotesByPollId($poll_id, $votesToDelete) {
+    	$prepared = $this->prepare('DELETE FROM `' . Utils::table('vote') . '` WHERE poll_id = ? ORDER BY `poll_id` ASC LIMIT ' . $votesToDelete);
 
+        return $prepared->execute([$poll_id]);
+    }
+    
     /**
      * Delete all votes of a given poll.
      *
diff --git a/app/classes/Framadate/Services/PurgeService.php b/app/classes/Framadate/Services/PurgeService.php
index 7b59b7a..dca8378 100644
--- a/app/classes/Framadate/Services/PurgeService.php
+++ b/app/classes/Framadate/Services/PurgeService.php
@@ -46,7 +46,28 @@ class PurgeService {
 
         return $count;
     }
-
+    
+    public function cleanDemoPoll() {
+    	
+    	if (	!defined("DEMO_POLL_ID")
+    		||	!defined("DEMO_POLL_NUMBER_VOTES")
+    	) {
+    		return;
+    	}
+    	
+    	$this->voteRepository->beginTransaction();
+    	
+    	$demoVotes = $this->voteRepository->allUserVotesByPollId(DEMO_POLL_ID);
+    	$votesToDelete = count($demoVotes) - DEMO_POLL_NUMBER_VOTES;
+    	
+    	if ($votesToDelete > 0) {
+    		$this->voteRepository->deleteOldVotesByPollId(DEMO_POLL_ID, $votesToDelete);
+    	}
+    	
+    	$this->voteRepository->commit();
+    	
+    }
+    
     /**
      * This methode delete all data about a poll.
      *