We are having the same trouble with flies and mosquitoes and we are in Geelong. The poor dogs ears are always covered in flies and I haven't found a solution yet, I've used a pinkish coloured soap(??) that smells like citronella, but it doesn't work that well.
I am looking for something that won't stain or grease up as two of the dogs are light coloured and are currently being shown, any ideas?
Also noticed that what ever gets put on, will be promptly licked off by the other dog. it seems to be a bit of a cycle, I put it on, the next dog gets done and the previous is having their ears cleaned by the next dog they don't seem to like the taste, and start to foam up a bit. I'll try anything BUT I don't really want to poison them either.