I JUST had this problem!! I cleaned everything really well and did put those ant huts around the cage (out of reach of curious gliders). I also read that bounce dryer sheets keep the aunts away from the cage. Like, I put them underneath the wheels, which is how they would climb up and in the cage, and since I put the bounce sheets under the wheels, I have not seen ONE ant, in or around the cage. I use the ant huts bc they work and the gliders are not allowed out of the cage unless they are sleepy or in the tent, so them finding them is never an issue.
Hope this helps! :)