Liz Buchanan BVSc MRCVS
Hello! I'm afraid that I agree that the remedies you mentioned generally make ears worse rather than better.
How do you know that an infection is present? A lot of what we used to assume to be ear 'infections' are now known to be inflammation, more often than not caused by skin allergy (ear canals are just skin down a hole) and a lot of the old remedies for ear disease tend to be strong allergens! Thereby, in the long term, they exacerbate a lot of the modern causes of ear disease.
It's easy to think 'only an ear problem' but ear disease is one of the most stressful, recurring complaints in veterinary medicine, because the chronic form ( skin allergy ) tends to recurr throughout a dogs' life and accounts for most cases. In a pup however, you have to be aware that there may be parasites eg mites involved, or congenital ear problems, which a vet can easily rule out, as well as possible foreign bodies. All can look quite similar from the outside.
You are obviously not in the UK if there is such a drive involved, but in absence of better knowledge of how animal healthcare works in your country, we would advise traveling 12 hours and getting him seen by a vet.