Me. Rev. Stat. tit. 32, § 6196

Any waiver of the provisions of this chapter is void and unenforceable as contrary to public policy, except that a foreclosed homeowner may waive the 5-day right to cancel provided in section 6195 if the property is subject to a foreclosure sale within the 5 business days and the foreclosed homeowner agrees to waive the right to cancel in a handwritten statement signed by all parties holding title to the foreclosed property.