JSFiddle - React, Tailwind, and code Playground
HTML
<select>
<option value>Blank #1</option>
<option value="foo">Foo</option>
<option value>Blank #2</option>
<option value="bar">Bar</option>
</select>
<select>
<option>Blank #1</option>
<option value="foo">Foo</option>
<option>Blank #2</option>
<option value="bar">Bar</option>
</select>
JavaScript
$('select').val('')