Wis. Stat. § 409.623: Right to redeem collateral.

(1) Persons that may redeem. A debtor, any secondary obligor, or any other secured party or lienholder may redeem collateral.

(2) Requirements for redemption. To redeem collateral, a person shall tender:

(a) Fulfillment of all obligations secured by the collateral; and

(b) The reasonable expenses and attorney fees described in s. 409.615 (1) (a).

(3) When redemption may occur. A redemption may occur at any time before a secured party:

(a) Has collected collateral under s. 409.607;

(b) Has disposed of collateral or entered into a contract for its disposition under s. 409.610; or

(c) Has accepted collateral in full or partial satisfaction of the obligation it secures under s. 409.622.