My lovely Norm keeps constantly cleaning and fiddling with his right ear.After cleaning or if I touch his ear he shakes his head violently.Norm came from Washington DC,USA under a year ago and he was a feral rescue cat and I know feral cats get ticks and ear lice but he was checked and cleared 3/4 times in America for live,ticks and infection.As often with neutered feral cats one of his ears was clipped to denote he was neutered but the clipped ear is fine.Ive checked his ear several times and put special ear drops in but all I can see is some darkish wax which I know most cats get?A friend suggested to me that years ago when he was rescued he may have had a serious ear lice/tick problem and he does it out of habit? Any suggestions as to next course of action?