You sure it's the geckos and not their crickets? I find that sometimes my critter keeper full of crickets gets pretty darn stinky - it's a good plan to at least wipe it out with a wet paper towel or similar before refilling it with fresh crickets, and every couple of times I like to actually wash it out with soap or bleach solution and then rinse it very well.

Presuming that's not it, you can use a bleach solution to clean out the terrarium, which should nullify just about any smell, but of course be sure to rinse the hell out of it after and make sure it's completely dry and not smelling at all like bleach before reinserting geckos. The same goes for all their stuff - you can use bleach solution on it, just make sure you rinse it *very* well, and be absolutely sure there's no bleach left behind afterward.

I've found this to work well, and it's a good idea to do this every now and then anyway, just to make sure there isn't a pile of bacteria or other nastiness accumulating.
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0.1 Albino Leopard Gecko - Tigger
0.0.1 Crested Gecko - Pooh-Bear

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