Why do you need the fields to be cleared?
If you clear the fields before the form is submitted, that information won't be present in the POST / GET data. It sounds a little over the top to want to clear the fields. I would just take precautions that cookies aren't made or saved, you're using SSL to submit the data and the data isn't redisplayed to the user, whereas sensitive information won't make its way to the browser's cache, otherwise you ought to be alright.
Espere que esto ayude! Adios! :-)
Regards,
Rich
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