I had a similar problem, what kind of cage do u use? Aquarium with a screen top?
Welli went a bought a 60-70 dollar dogger from petsmart and I would put it on full blast for 2 hours with a towel on top, then shut it off for 45 mins, then I put it on low out for 1 hour times, for about 3-4 times. Next day... It was gone!!! I hope this informational for you!