Wis. Stat. § 75.285
No action or proceeding shall be maintained by the former owner or any person claiming under the former owner, based upon the invalidity of any tax certificate or tax deed due to the failure of the county treasurer to give notice under s. 74.59, unless there is deposited with the clerk of circuit court, at the time the action is commenced under s. 801.02, an amount of money equal to either the full amount of all delinquent taxes currently outstanding against the parcel of property which is the subject of the action, plus interest and penalty under s. 74.47, or if the county has taken a tax deed, the full amount payable under s. 75.36(3) (a) and (b). The deposited funds shall be held by the clerk of circuit court and paid out as directed by the judgment in the action or proceeding.
Wis. Stat. § 75.285