Laminate floors are very durable but not indestructible. Dirt can be abrasive and cause floors to dull. Avoid this by sweeping with a good broom, dust mopping, or vacuuming (without a beater bar) regularly to remove loose dirt and grit.
Vacuum cleaner attachments are very effective in picking up dirt from between planks and along edges. Using a damp (not wet) mop occasionally is also suggested; however, your laminate flooring can expand if excessive water is used while cleaning. After damp mopping, a clean dry cloth should be used to wipe your floor thoroughly.
Place area rugs or doormats at each entry to collect excess moisture and dirt before they enter your home.