the search is stored in a session variable, this is done so that search results will be retained when using the paging controls.
the session will be name using the following naming convention:
WADbSearch1_<page_name>
so on Products_Results.php, the session would be named:
WADbSearch1_Products_Results
you can create a link to clear the results passing a query string variable:
<a href="Products_Results.php?clear=true">Clear Results</a>
then add the following code at line 1 of the results page:
<?php
@session_start();
if(isset($_GET['clear']) && $_GET['clear'] == "true") {if(isset($_SESSION['WADbSearch1_Products_Results'])) unset($_SESSION['WADbSearch1_Products_Results']);}
?>