To flush out your eyes, tilt your head so the affected eye is lower, hold your eyelids open, and let clean lukewarm water flow gently across the surface of the eye for at least 15 to 20 minutes. The exact technique and timing depend on what got into your eye, whether it’s dust, a splash of cleaning product, or something more serious like an industrial chemical.
Step-by-Step Eye Flushing at Home
Start by washing your hands. If you’re wearing contact lenses, remove them before or during flushing, since debris can get trapped underneath the lens. Then follow these steps:
- Position your head. Tilt it to the side of the affected eye so water runs away from your uninjured eye, not into it. If both eyes are affected, alternate between them or stand under a gentle shower stream with your head tilted slightly forward.
- Hold your eyelids open. Use the fingers of one hand to keep both the upper and lower lids pulled apart. This feels unnatural, especially when your eye is irritated, but the fluid needs to reach the entire surface of the eye and the pockets behind both lids.
- Direct the water flow. Pour or run clean, lukewarm water from the inner corner of the eye (near the nose) outward. Keep the stream gentle. Never aim a strong jet directly at the center of your eye.
- Move your eye around. While the water is flowing, look up, down, left, and right. This helps the fluid reach areas that a straight-ahead gaze would leave untouched, including the spaces behind your eyelids.
- Keep going. Continue flushing for at least 15 to 20 minutes. Set a timer. It will feel like a long time, but thorough irrigation is the single most important thing you can do to limit damage from a chemical exposure.
If you’re helping someone else, have them lie down with a towel under their head and a bowl positioned against their cheek to catch runoff. Pour water slowly and steadily from no more than about two inches above the eye surface.
What Fluid to Use
Sterile saline solution or a commercially prepared eyewash is the safest choice for flushing your eyes. These products match the salt concentration of your natural tears, so they cause minimal irritation to the delicate surface cells of the eye.
Tap water is a different story. It contains less salt than your tears and eye tissue, which can irritate the eye surface and even damage cells with prolonged exposure. The American Academy of Ophthalmology recommends against using tap water for routine eye rinsing. The exception is an emergency: if a chemical splashes into your eye, grab whatever clean water is closest and start flushing immediately. Waiting to find sterile saline while a corrosive substance sits on your eye is far more dangerous than any irritation from tap water.
Use lukewarm water, ideally between 60°F and 100°F (16°C to 38°C). Water that’s too cold causes reflex blinking and makes it harder to keep your eye open. Water that’s too hot can add thermal injury on top of whatever you’re already dealing with.
How Long to Flush for Different Situations
A small piece of dust or an eyelash usually washes out within a minute or two of gentle rinsing. You’ll feel immediate relief once the particle is gone.
Chemical splashes require much longer flushing. The Mayo Clinic recommends at least 20 minutes of continuous irrigation with clean, lukewarm water after any chemical splash. This applies to household products like bleach, oven cleaner, or drain opener just as much as it does to industrial chemicals.
Alkaline substances (found in many cleaning products, cement dust, and oven cleaners) are particularly dangerous because they continue penetrating deeper into eye tissue even after the initial splash. These burns often need extended irrigation well beyond the 20-minute minimum. Acidic substances like vinegar or battery acid tend to cause damage closer to the surface and are somewhat less likely to penetrate deeply, but they still require the full 20 minutes of flushing.
Do not try to neutralize a chemical by flushing with a different chemical. Use only water or saline.
Flushing Out a Foreign Object
For a speck of dirt, sand, or a small insect, flushing with water is usually enough. If the particle doesn’t come out after a few minutes of irrigation, try pulling your upper eyelid out and down over your lower eyelid. The lower lashes can sometimes sweep debris off the inside of the upper lid.
Do not rub your eye. Rubbing can press a sharp particle into the surface of the eye and scratch the cornea, turning a minor irritation into a painful abrasion that takes days to heal. If you can see a particle resting on the white of the eye, you can try to gently touch it with a damp cotton swab, but never attempt this on the colored part of the eye (the iris or pupil area).
If something is embedded in the eye, or if you were grinding, drilling, or hammering metal when the injury happened, do not try to flush or remove it yourself. Metal fragments and other embedded objects require professional removal.
Mistakes That Make Things Worse
The most common error is not flushing long enough. People rinse for 30 seconds, feel some relief, and stop. With chemical exposures, the substance may still be present in the folds behind your eyelids and will continue causing damage. Twenty minutes is the minimum, not a suggestion.
Another frequent mistake is forgetting to lift the eyelids. Your upper and lower eyelids create pocket-like spaces where chemicals and debris collect. If you only flush across the front of the eye without pulling the lids open, you’ll miss these areas entirely. Periodically lift both the upper and lower lids during irrigation to let the water reach underneath.
Rubbing the eye after flushing is also a problem. Even once you’ve rinsed a chemical away, the eye surface may be fragile. Rubbing can worsen existing damage or push residual particles into the tissue.
Signs You Need Medical Attention
After flushing, some mild redness and a gritty feeling are normal and usually resolve within a few hours. But certain symptoms signal that flushing alone wasn’t enough.
Any chemical exposure to the eye warrants a medical evaluation, even if you flushed thoroughly and the eye feels better. Some chemical burns cause delayed damage that isn’t immediately obvious. Persistent pain, continued tearing, blurred vision, sensitivity to light, or swelling after flushing all point to the need for prompt care. If you notice a white or cloudy patch on the normally clear front surface of the eye, that suggests a more serious burn.
For foreign objects, get evaluated if you still feel something in the eye after flushing, if your vision is blurry, or if you have a persistent scratchy sensation that doesn’t improve within a few hours. A scratched cornea typically heals on its own, but deeper injuries may need treatment to prevent infection or scarring.