Reply To: remove the ASP button in the editor

That should work though, maybe putting it to the actual hook for a delay:

add_filter('admin_head', function(){
	remove_action('admin_head', 'wpdreams_asp_add_mce_button');
	remove_action('admin_head', 'wpdreams_asp_mce_generate_variable');
	remove_filter( 'mce_external_plugins', 'wpdreams_asp_add_tinymce_plugin' );
	remove_filter( 'mce_buttons', 'wpdreams_asp_register_mce_button' );
});