Downy's money back guarantee runs through 6/30/2013. You need to request the refund within 30 days of purchase and send in the dated, store-identified receipt along with the UPC. Oddly, the form does not request a reason for the refund request. Your refund will actually arrive in the form of a pre-paid card and not a check.
Link to rebate form to get your money back if you're dissatisfied