Iowa Code § 714F.6: Waiver.

A waiver of the provisions of this chapter is void and unenforceable as contrary to public policy, except a consumer may waive the three-day right to cancel provided in section 714F.4 if the property is subject to a foreclosure sale, tax sale, or contract forfeiture within the three business days and the shortened cancellation period was not caused by the foreclosure purchaser or an agent of the foreclosure purchaser. A waiver of a foreclosed homeowner’s right to cancel shall be in a handwritten statement signed by all parties holding title to the foreclosed property.