You can get em at Walmart Tiffany, at least the Betadine.

Chlorhexidine can be had at Reptile BAsics or your vet.

If he's got that much Tiff, you need to get him on some antibiotics so it doesnt go systemic. That crap will work its way up into the skull and bone and it aint pretty.

The antibiotics wont get it rid of completely, but will stop it from progressing. You will also have to manually eliminate the build up with the qtips and Betadine.

You CAN culture for the right antibiotic by getting in deep under the cheesy stuff and taking a culture there if you like. I might ask if it'd be better to get right on some Amikacin or Fortaz though, whether it be for a treatment, or while you wait for the culture results.