HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.removeData clear all</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    #box { padding: 14px; background: #e0e7ff; border-radius: 8px; margin-bottom: 12px; }
    button { margin: 4px 6px 4px 0; padding: 8px 12px; }
    #out { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; white-space: pre-wrap; font-family: monospace; }
  </style>
</head>
<body>
  <div id="box">Target</div>
  <button type="button" id="set">Set a &amp; b</button>
  <button type="button" id="clear">Clear all</button>
  <div id="out">Click Set, then Clear all.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var el = document.getElementById( "box" );
    function show() {
      $( "#out" ).text( JSON.stringify( jQuery.data( el ), null, 2 ) );
    }
    $( "#set" ).on( "click", function () {
      jQuery.data( el, "a", 1 );
      jQuery.data( el, "b", 2 );
      show();
    });
    $( "#clear" ).on( "click", function () {
      jQuery.removeData( el );
      show();
    });
  </script>
</body>
</html>

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jQuery.removeData() — clear all (Try It)