Final answer:
The most effective way to remove a foreign body from the eye is to flush the eye with clean, lukewarm water.
Step-by-step explanation:
The most effective way to remove a foreign body from the eye is to flush the eye with clean, lukewarm water. This helps to irrigate the eye and wash out the object. Using a cotton swab or rubbing the eye with a cloth can actually cause more damage and potentially push the object further into the eye. It's important to wait for medical assistance if the object is deeply embedded or if the child is experiencing severe pain or vision changes.