William John on Instagram: "SINUS IRRIGATION (NASAL IRRIGATION): BENEFITS, HOW-TO, & SAFETY GUIDE Sinus irrigation (aka nasal rinsing or lavage) flushes nasal passages with saline solution to clear mucus, allergens, and irritants. It's a proven, low-cost way to relieve congestion - backed by studies for chronic sinusitis, allergies, and colds. Key Benefits (From Research): Clears Congestion — Reduces nasal blockage, post-nasal drip, and pressure (effective for sinus infections/allergies). Improv