Something like this should work.

Give all of your fields that you want cleared the class name of clearThisField.  Then add this Javascript: 

$(document).ready(function() {
  
  //When the form is loaded, loop through all fields with the 
  //clearThisField class and clear them.
  $('.clearThisField').each(function() {
    $(this).find('input').val('');                         //Clear single line fields.
    $(this).find('textarea').val('');                      //Clear multi-line fields.
    $(this).find('select').val('');                        //Clear drop-down fields.
    $(this).find('input:checked').prop('checked', false);  //Clear checkbox and radio button fields.
  });
  
  //This line is optional, but if included, the validation will be run on
  //the form after clearing them from the code above, and any required
  //fields will be marked as failing the validation.
  $('#form1').parsley().validate();
  
});

This is my form without the Javascript:

And this is my form with the Javascript: