Olive oil, or any oil for that matter, doesn't get rid of earwax. It may soften hard earwax, but in order to remove excess wax, you would need to follow up with a warm water lavage. Washing the ear out with warm water is the safest way to wash out excess ear wax.
Olive oil is safe to use in an ear canal to soften ear wax, assuming the ear drum is intact (no rupture or tubes). If there is ear pain or other signs of infection, oil should not be used.
Remember that earwax is a beneficial coating to the ear canal, protecting it from water and other moisture. It is not dirt. In most cases, it does not need to be removed unless there is a wax impaction. The use of Q-tips is never indicated in the ear.
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