WordPress at a glance
action is not described

clean_attachment_cache action-hook . WP 3.0.0

Fires after the given attachment's cache is cleaned.

Usage

add_action( 'clean_attachment_cache', 'action_function_name_2836' );
function action_function_name_2836( $id ){
	// action...
}
$id(int)
Attachment ID.

Where the hook is called

clean_attachment_cache()
wp-includes/post.php 6169
do_action( 'clean_attachment_cache', $id );

Where the hook is used (in WP core)

Does not used.