Natural remedy for dog's itchy ear?

My little dog has an itchy ear & I was hoping to try an at-home remedy rather than go to the vet first (I'll definitely take him if it persists of course). He goes regularly to the vet for things like 6-monthly check ups, heart murmur checks etc.
He has one ear up and the other tilted down. He's also been rubbing his ear into firm surfaces.
A relative thinks a natural lubricant such as a little olive oil massaged in well could help, but I'm unsure.
UPDATE: he's booked into the vet, I'm taking h after work. Thanks for the advice.