Wash linen napkins in cold or lukewarm water on a gentle cycle with mild, bleach-free detergent. Treat stains immediately by rinsing with cold water; avoid harsh rubbing. Air-dry naturally, preferably flat or line dry. Iron when damp for a refined look, or leave natural for a relaxed aesthetic. Store in a cool, dry place. Over time, linen becomes softer and more absorbent, enhancing its appeal with each wash.