I use a spray bottle containg white vinegar which I spray about when I need some disinfecting. I have been feeding BARF for several years, and have yet to have a problem with bacterial infections with my dogs. Well, except for when I got them micro-chipped. Keep in mind that vets are told very little about dog diet at university. In fact, in some universities, reps from the dog food companies, come and do presentations on dog diet, as part of the curriculum.
Many vets get their education on dog diet by dog food reps.
And many vets make a lot of money by retailing dog foods. If you have a vet that doesn't want to be re-educated, or will not discuss options, then that is a very sad state of affairs. Here's hoping you can find a better vet. Given this age of the internet, there is absolutely no excuse for vets not to be educated on all feeding options. That being said, there are plenty of vets out there now who realise that there are significantly better alternatives to commercial dog food.