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You should flush the eye with some warm saline and then dry it well with a clean, dry towel.
If it gunks up or does not start to heal, you will need to see your vet.
The vet will probably want to stain the eye to check for lacerations and other problems.
If there is green or yellow gunk, you will probably need antibiotics so that it can heal.
Let me know if you still have questions about this.