diff --git a/includes/utilities.inc b/includes/utilities.inc
index 800009e..3ab94ee 100644
--- a/includes/utilities.inc
+++ b/includes/utilities.inc
@@ -4,6 +4,20 @@
  * Contains helper functions for working with Relais requests.
  */
 
+/**
+ * Clean the form content before sending it to relais or logging it.
+ *
+ * @param $value
+ * @param $key
+ */
+function upei_roblib_ill_check_arr_item(&$value, $key) {
+  if(is_array($value)) {
+    array_walk($value, 'upei_roblib_ill_check_arr_item');
+  } else {
+    $value = check_plain($value);
+  }
+}
+
 /**
  * Removes empty elements and drupal specific elements from an array
  *
@@ -47,6 +61,7 @@ function upei_roblib_ill_clean_array($values) {
   unset($arr['doi']);
   unset($arr['doi_button']);
   unset($arr['honeypot_time']);
+  array_walk($arr, 'upei_roblib_ill_check_arr_item');
   return $arr;
 }