diff --git a/src/Libs/Model.php b/src/Libs/Model.php
index 8e59f55..f5fb9d0 100644
--- a/src/Libs/Model.php
+++ b/src/Libs/Model.php
@@ -201,6 +201,23 @@ class Model {
         return $sql;
     }
 
+
+    /**
+     * Configura $queryVars para vincular un valor a un
+     * parámetro de sustitución y devuelve este último.
+     *
+     * @param string $value
+     *   Valor a vincular.
+     *
+     * @return string
+     *   Parámetro de sustitución.
+     */
+    private static function bindValue(string $value) : string{
+        $index = ':v_'.count(static::$queryVars);
+        static::$queryVars[$index] = $value;
+        return $index;
+    }
+
     /**
      * Crea una instancia del objeto actual a partir de un arreglo.
      *
@@ -380,17 +397,6 @@ class Model {
         return new static();
     }
 
-    /**
-     * Elimina los caracteres que no son alfanuméricos o _.
-     *
-     * @param string $string
-     *
-     * @return string
-     */
-    private static function cleanString(string $string) :string {
-        return preg_replace('/[^A-Za-z0-9_]/', '', $string);
-    }
-
     /**
      * Define el WHERE en la sentencia SQL.
      *
@@ -415,13 +421,10 @@ class Model {
             $operatorOrValue = '=';
         }
 
-        if ($no_filter) {
-            static::$querySelect['where']   = "$column$operatorOrValue$value";
-        } else {
-            $cleanColum = static::cleanString($column);
-            static::$queryVars[":where_$cleanColum"] = $value;
-            static::$querySelect['where']   = "$column$operatorOrValue:where_$cleanColum";
-        }
+        if (!$no_filter)
+            $value = static::bindValue($value);
+
+        static::$querySelect['where']   = "$column $operatorOrValue $value";
 
         return new static();
     }
@@ -442,9 +445,8 @@ class Model {
      */
     public static function where_in(string $column, array $arr, bool $in = true) : Model {
         $arrIn = [];
-        foreach($arr as $index => $value) {
-            $arrIn[] = ":on_$index";
-            static::$queryVars[":on_$index"] = $value;
+        foreach($arr as $value) {
+            $arrIn[] = static::bindValue($value);
         }
 
         if ($in)
@@ -563,13 +565,10 @@ class Model {
             $operatorOrValue = '=';
         }
 
-        if ($no_filter)
-            static::$querySelect['AndOr'] .= " AND $column$operatorOrValue$value";
-        else {
-            $cleanColum = static::cleanString($column);
-            static::$queryVars[":and_$cleanColum"] = $value;
-            static::$querySelect['AndOr'] .= " AND $column$operatorOrValue:and_$cleanColum";
-        }
+        if (!$no_filter)
+            $value = static::bindValue($value);
+
+        static::$querySelect['AndOr'] .= " AND $column $operatorOrValue $value";
 
         return new static();
     }
@@ -598,13 +597,10 @@ class Model {
             $operatorOrValue = '=';
         }
 
-        if ($no_filter)
-            static::$querySelect['AndOr'] .= " OR $column$operatorOrValue$value";
-        else {
-            $cleanColum = static::cleanString($column);
-            static::$queryVars[":or_$cleanColum"] = $value;
-            static::$querySelect['AndOr'] .= " OR $column$operatorOrValue:or_$cleanColum";
-        }
+        if (!$no_filter)
+            $value = static::bindValue($value);
+
+        static::$querySelect['AndOr'] .= " OR $column $operatorOrValue $value";
 
         return new static();
     }
@@ -744,15 +740,15 @@ class Model {
 
         $db = static::db();
 
-        static::$queryVars[':search'] = $search;
+        $search = static::bindValue($search);
         $where = [];
 
         if (DB_TYPE == 'sqlite')
             foreach($in as $row)
-                $where[] = "$row LIKE '%' || :search || '%'";
+                $where[] = "$row LIKE '%' || $search || '%'";
         else
             foreach($in as $row)
-                $where[] = "$row LIKE CONCAT('%', :search, '%')";
+                $where[] = "$row LIKE CONCAT('%', $search, '%')";
 
 
         if (static::$querySelect['where']=='')