Believe it or not, one thing that works for my basset's itchy pits (which the vet told us to try), is sprinkle a little Gold Bond powder on the itchy area. It does wonders when his little armpits are bothering him! I don't think this can be used in the ear or tail area though.
For ears, I clean my basset's ears with Epi-Otic ear cleanser , which I purchase online. It is very mild, and doesn't cause irritation and MORE itching like other brands we've tried. Good luck!!