[header] How to clean a terrier's ears [title] Get the right ingredients. [step] There are certain cleaners you should use to treat your dog's ear. Any you buy should be made specifically as an ear cleaner that is safe for dogs. 
Look for products that have ingredients that will clean off dead cells and ceruminolytic properties, which help break up earwax. [substeps] They should also be mildly acidic to help kill bacteria and be able to evaporate quickly.