"Bacterial, viral or fungal lung infections can cause respiratory signs. So can lung mites, lung worms, lung abscesses, lung cancer and heart failure. These are all very different and respond differently to different treatments...."
That being said, how can wiping the insides of the mouth possibly help??? The issue lies WITHIN the snake and only a proper vet can determine where the issue lies and how to treat it.
In my personal opinion, it is extremely irresponsible to keep animals when you don't have access to a proper vet. Animals get sick and injured, it's a fact of keeping animals. If you can't get your animals to a vet when this happens, and it inevitably will, I don't think it's fair to the animals to keep them.
It is also the keepers responsibility to properly quarantine new animals.
I'm sorry if I'm coming off harsh, but it is unfair to the innocent animals that don't have a choice.