HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.removeData plugin</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    #box { padding: 14px; background: #dbeafe; border-radius: 8px; margin-bottom: 12px; font-weight: 600; }
    button { margin: 4px 6px 4px 0; padding: 8px 12px; }
    #out { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; white-space: pre-wrap; }
  </style>
</head>
<body>
  <div id="box">Host</div>
  <button type="button" id="init">Init counter</button>
  <button type="button" id="destroy">Destroy</button>
  <div id="out"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $.fn.counter = function ( opts ) {
      return this.each(function () {
        jQuery.data( this, "counter", opts || { n: 0 } );
        $( this ).text( "n = " + jQuery.data( this, "counter" ).n );
      });
    };
    $.fn.counterDestroy = function () {
      return this.each(function () {
        jQuery.removeData( this, "counter" );
        $( this ).text( "Host (cleared)" );
      });
    };
    function show() {
      $( "#out" ).text( "counter = " + JSON.stringify( jQuery.data( $( "#box" )[ 0 ], "counter" ) ) );
    }
    $( "#init" ).on( "click", function () {
      $( "#box" ).counter( { n: 5 } );
      show();
    });
    $( "#destroy" ).on( "click", function () {
      $( "#box" ).counterDestroy();
      show();
    });
  </script>
</body>
</html>

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jQuery.removeData() — plugin destroy (Try It)