Seawater may look “natural,” but it is not sterile—so using it to “clean” or treat the eye is not a safe practice. This is especially important for contact lens wearers: water exposure (ocean, pool, shower) is considered a risky behavior because microbes can become trapped between the lens and the cornea, increasing the risk of serious infections. Eye “cleaning” is therefore a medical-safety topic, not a cosmetic trick. So what safely cleans the eye? Under normal conditions, the eye is self-cleaning: the tear film and blinking mechanism wash away debris. Safe home practices include good hand hygiene, gentle lid-margin cleaning with appropriate products when advised, and supporting the ocular surface with suitable artificial tears if needed. Putting lemon, alcohol-based liquids, random herbal mixtures, or oils into the eye can irritate the surface and raise infection risk. For chemical splashes or suspicious substance exposure, first aid is clear: remove contact lenses if present and flush the eye with plenty of clean, lukewarm water for at least 15–20 minutes, then seek urgent medical evaluation. Likewise, severe pain, light sensitivity, marked redness, discharge, or significant vision reduction should prompt professional assessment rather than “home cleaning.” In short: the safest eye care is not seawater—it’s proper hygiene, appropriate medical products when indicated, and timely clinical evaluation when red flags appear.