Achieving the perfect beer pour hinges on a clean glass. Residue, oils, and even invisible imperfections can disrupt the beer's head formation and flavor. Experts recommend using a dedicated glass-cleaning brush or sponge, avoiding harsh detergents that can leave behind residue. Rinse thoroughly with cold water and allow the glass to air dry upside down. Proper cleaning eliminates nucleation points, preventing excessive bubbling and ensuring a smooth, consistent pour that showcases the beer's true aroma and taste. This simple practice elevates the entire beer-drinking experience.