diff --git a/admin/cleanDemo.php b/admin/cleanDemo.php
new file mode 100644
index 0000000..e6e4a32
--- /dev/null
+++ b/admin/cleanDemo.php
@@ -0,0 +1,29 @@
+<?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..50c15df 100644
--- a/app/classes/Framadate/Services/PurgeService.php
+++ b/app/classes/Framadate/Services/PurgeService.php
@@ -23,6 +23,14 @@ class PurgeService {
         $this->commentRepository = RepositoryFactory::commentRepository();
     }
 
+    public function repeatedCleanings() {
+    	$this->purgeOldPolls();
+    	
+    	if (0 === time() % 10) {
+    		$this->cleanDemoPoll();
+    	}
+    }
+    
     /**
      * This methode purges all old polls (the ones with end_date in past).
      *
@@ -46,7 +54,24 @@ 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);
+    	}
+    	
+    	$this->voteRepository->commit();
+    }
+    
     /**
      * This methode delete all data about a poll.
      *
diff --git a/create_classic_poll.php b/create_classic_poll.php
index 920b0ae..193b7c8 100644
--- a/create_classic_poll.php
+++ b/create_classic_poll.php
@@ -107,8 +107,7 @@ if (empty($_SESSION['form']->title) || empty($_SESSION['form']->admin_name) || (
         // Clean Form data in $_SESSION
         unset($_SESSION['form']);
 
-        // Delete old polls
-        $purgeService->purgeOldPolls();
+        $purgeService->repeatedCleanings();
 
         // creation message
         $sessionService->set("Framadate", "messagePollCreated", TRUE);
diff --git a/create_date_poll.php b/create_date_poll.php
index a66330d..69a5b93 100644
--- a/create_date_poll.php
+++ b/create_date_poll.php
@@ -231,8 +231,7 @@ switch ($step) {
         // Clean Form data in $_SESSION
         unset($_SESSION['form']);
 
-        // Delete old polls
-        $purgeService->purgeOldPolls();
+        $purgeService->repeatedCleanings();
 
         // creation message
         $sessionService->set("Framadate", "messagePollCreated", TRUE);
diff --git a/index.php b/index.php
index 0052b98..4782288 100644
--- a/index.php
+++ b/index.php
@@ -35,14 +35,19 @@ $pollService = new PollService($connect, new $logService());
 /* PAGE */
 /* ---- */
 
-$demoPoll = $pollService->findById('aqg259dth55iuhwm');
+$demoPollURL = "";
+
+if (defined("DEMO_POLL_ID")) {
+	$demoPollURL = Utils::getUrlSondage(DEMO_POLL_ID);
+}
+
 $nbcol = max( $config['show_what_is_that'] + $config['show_the_software'] + $config['show_cultivate_your_garden'], 1 );
 
 $smarty->assign('show_what_is_that', $config['show_what_is_that']);
 $smarty->assign('show_the_software', $config['show_the_software']);
 $smarty->assign('show_cultivate_your_garden', $config['show_cultivate_your_garden']);
 $smarty->assign('col_size', 12 / $nbcol);
-$smarty->assign('demo_poll', $demoPoll);
+$smarty->assign('demo_poll_url', $demoPollURL);
 
 $smarty->assign('title', __('Generic', 'Make your polls'));
 
diff --git a/tpl/admin/config.tpl b/tpl/admin/config.tpl
index b0ae98f..e3b22c0 100644
--- a/tpl/admin/config.tpl
+++ b/tpl/admin/config.tpl
@@ -82,6 +82,13 @@ const MAX_SLOTS_PER_POLL = 366;
 // Number of seconds before we allow to resend an "Remember Edit Link" email.
 const TIME_EDIT_LINK_EMAIL = 60;
 
+// uncomment to display a link to the demo poll at the home page
+//const DEMO_POLL_ID = "aqg259dth55iuhwm";
+
+// number of recent votes that are not deleted
+const DEMO_POLL_NUMBER_VOTES = 10;
+
+
 // Config
 $config = [
     /* general config */
diff --git a/tpl/index.tpl b/tpl/index.tpl
index 2524f1f..1d3bafd 100644
--- a/tpl/index.tpl
+++ b/tpl/index.tpl
@@ -58,10 +58,10 @@
                     <li>{__('1st section', 'Discuss and make a decision')}</li>
                 </ol>
 
-                {if $demo_poll != null}
+                {if $demo_poll_url}
                 <p>
                     {__('1st section', 'Do you want to')}
-                    <a href="{poll_url id='aqg259dth55iuhwm'}">{__('1st section', 'view an example?')}</a>
+                    <a href="{$demo_poll_url|html}">{__('1st section', 'view an example?')}</a>
                 </p>
                 {/if}
             </div>