I was having the same problem, and I got a couple of sugestions which you can read below in the forum, just look for a post with my name.
Anyways I wasnt able to acquire the stuff that was recommended, and it was getting a bit too much, so I got a thing of bug spray that said it worked against gnats, flies, etc. But did have a caution against using with animals.
So what I did was remove the dirt from the cage which is what I had my uro on, rinsed the cage, sprayed it, waited minutes and rinse very well. Now hes back in on towel paper.
I just did this today, but so far everything seems good.
One thing I read and I was told below is that the bugs are atracted to and need humidity, so you can check places that are humid or have mold or what not, which is theyre breeding ground. In my case was the dirt which I threw out, as I read that to kill the whole thing you needed to remove or fix the places with the humidity that they use as a breeding ground and also use the spray (I think that was the directions on the can).
But be carefull with the spray its pretty heavy stuff.
Dont know if you want to try this method or not, just thought Id help out since Im going through the same thing.
Good Luck
Jack
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0.1 Hypo-Tang Leopard Gecko
0.1 Tremper Albino Hypo Tang Leopard Gecko
1.0 Hypo Tang Leopard Gecko
1.0 Crested Geckos
0.0.1 CB Baby Saharan Uromastyx