Received this with other stuff in my mailbox today:

Eliminate ear mites... All it takes is a few drops of Wesson corn oil in
your cat's ear. Massage it in, then clean with a cotton ball. Repeat daily
for 3 days. The oil soothes the cat's skin, smothers the mites, and
accelerates healing.

Vaseline cure for hair balls..... To prevent troublesome hair balls, apply
a dollop of Vaseline petroleum jelly to your cat's nose. The cat will lick
off the jelly, lubricating any hair in its stomach so it can pass easily
through the digestive system.

- Ruby Tuesday