Important: These are minimum guidelines. Healing times vary from person to person, and swimming too soon increases your risk of infection.
Recommended:
Just use clean water to flush it out. Fresh bottled water or distilled water works best.
The main goal is to wash away any bacteria gathering around the wound. If you are in a pinch, never use hydrogen peroxide or rubbing alcohol. They are too harsh and will damage the healing tissue. Stick to clean water or a sterile saline spray.