Turn off all burner control knobs and wait for the grill to cool completely.
Raise the lid and lift off the cooking grate. Set the grate aside.
Remove and discard the old briquettes.
Lift out the grate underneath the briquettes to sweep out the interior bottom of the grill around the burner, using a whisk broom and dust pan. Replace the grate over the burner.
Arrange the new briquettes on the grate in a single layer, with each briquette touching the edges of the surrounding briquettes.
Set the cooking grate on top and close the grill lid.