remove recent viewed products in magento won´t wor

问题:

Hello I tried to remove the recent viewed product via local.xml, but it did not work and I don´t know why. Here my code:

<?xml version="1.0"?>

 <reference name="right">
    <action method="unsetChild"><alias>right.reports.product.viewed</alias></action>
    <action method="unsetChild"><alias>right.reports.product.compared</alias></action>
</reference>

<default>
    <action method="unsetChild"><name>right.reports.product.viewed</name></action>
     <action method="unsetChild"><name>right.reports.product.compared</name></action>
    <remove name="right.reports.product.viewed"/>
    <remove name="right.reports.product.compared"/>
</default>