I use a grill scraper brush thingy too. Wire bristles on one side and scraper on back. I love it!!! I follow it with a stiff bristled (think its boar hair) horse body brush...we had to sell the horses but alot of the grooming stuff is being repurposed...
Duct tape will also bring hair off cages...make a lint roller out of it by pulling a hank of tape off and wrapping it backward (sticky side out) back around the roll or around your hand...it pulls all the loose angora fluff off the walls and corners of my cages without alot of work for me. We use it about once a week.