Image not deleted?

I’ve just installed the plugin and then deleted a product with a single unique image that is not linked to any other product, when checking the Media Library the image is still there, product and image was uploaded a week before via csv import.
Did same again, moved 1 product to trash in the product edit screen, emptied trash, checked the Media Library and the image is still there, does the plugin have to be installed to track the images as the product is uploaded or is it because I have used this upload filter:
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wp-content\themes\homestore\functions.php adding day & hour to upload folder
/***** Change Defaults for Custom Uploads *****/

function upload_dir_filter($uploads){
$day = date(‘d’);
$hour = date(‘H’);
$uploads[‘path’] .= ‘/’ . $day . ‘/’ . $hour;
$uploads[‘url’] .= ‘/’ . $day . ‘/’ . $hour;
return $uploads;
}
add_filter(‘upload_dir’, ‘upload_dir_filter’);
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