My dog is shaking her head and her ears are clean. If there is a bug in her ear, how do I clean it? What can I use if it is ear mites?

It sounds like ear mites. You should take her to the vet. You know how it drives you crazy when something's in your ear? Ear mites cause a constant gnawing and itching. The vet will give you drops. Good luck.

It could be an infection or just about anything else. Don't self diagnose or treat without confirming with a vet

Head shaking is usually to do with the ears but sometimes it can be a neurological disorder.

As the above posters said, it's best to check with a vet to rule everything out.