Answers for "clear select inside a form"

jquery select clear options

$('#mySelect')
    .find('option')
    .remove()
    .end()
    .append('<option value="whatever">text</option>')
    .val('whatever')
;

reset select form jquery

$('select').each( function() {
        $(this).val( $(this).find("option[selected]").val() );
    });