Unfortunatly there are no herp vets that are certified in the DFW area. In order to do a trans treacheal wash on a snake it needs to be sedated so.... (not really the best option on a snake with breathing issues). That being said if the mucus has not cleared up, the infection is not gone. The baytril may need longer to work. If there is still an issue after a longer or different round of ab's a trans treacheal wash is then something that should be done to rule out fungal lung infectons such as asperigilosos etc. I have worked with many herp vets and as a tech at the bronx zoo. I was really dissapointed at the lack of specialist in general in the DFW area. It seems that if you want really good quality veterinary medicine in texas you need to drive to A&M.
If you are uncomfortable with your current vet and would like to try another one you can come to North Tollway Pet Hospital 972-733-3340 and make an appointment with Dr. Maxwell. He is ok with reptiles but also takes my advise even though I am a tech he values my experience with exotics.
If you have any other questions about this or are curiouse about the clinic please feel free to IM me
Ed