in the products_detail_clean.php file, i edited the line:
$WADetails = new WA_Include('webassist/plugins/catalog/details.php');
to:
$WADetails = new WA_Include('webassist/plugins/catalog/details_clean.php');
then copied the webassist/plugins/catalog/details.php as details_clean.php and in that file edited the image width:
$imgWidth = 200;
to:
$imgWidth = 600;