Mike, although this method can and will work, hatchlings and juveniles need a little more precaution. A friend of mine killed a yearling with a diluted Nix treatment a few years ago.
First, make sure the animal is VERY WELL hydrated. The major concern when spraying this treatment on animals is the chance they will ingest the pesticide. A lot of the time, when spraying a chondro, they instinctively start drinking.....especially young animals.
Second, try to remove as many of the mites as possible by rinsing it with fresh water first. This will also allow the animal to get a nice drink and help reduce the chance of poisoning.
Third, clean the cage, throw away any wood used or any porous objects used for decoration, and treat the cage with Nix. After you are certain the animal is satisfied with a nice drink, then lightly spray the animal and let it sit for about 10-30 minutes. You will usually see the mites fall off within a couple of minutes of being sprayed. After the time has elapsed, rinsed the animal with fresh water and place it back in it's cage.
BTW, although the Nix-mix works, I prefer the aerosol "Bedding Spray" over the mix treatment. It's much easier to use and you can see it coat the animal as it's being sprayed on. You can find this at any Walgreens, CVS, or Wal-Mart. Again, hydration and caution are the key, but the best treatment for mites is to never get them to begin with.
Good luck.
Brandon
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www.brandonosbornereptiles.com