(1) Real property upon which certificates of delinquency have been issued under the provisions of this chapter, may be redeemed at any time before the close of business the day before the day of the sale, by payment, as prescribed by the county treasurer, to the county treasurer of the proper county, of the amount for which the certificate of delinquency was issued, together with interest at the statutory rate per annum charged on delinquent general real and personal property taxes from date of issuance of the certificate of delinquency until paid.

(2) The person redeeming such property must also pay the amount of all taxes, interest and costs accruing after the issuance of such certificate of delinquency, together with interest at the statutory rate per annum charged on delinquent general real and personal property taxes on such payment from the day the same was made.

(3) No fee may be charged for any redemption.

(4) Tenants in common or joint tenants must be allowed to redeem their individual interest in real property for which certificates of delinquency have been issued under the provisions of this chapter, in the manner and under the terms specified in RCW 84.64.060 for the redemption of real property other than that of persons adjudicated to be legally incompetent or minors for purposes of this section.

(5) If the real property of any minor, or any person adjudicated to be legally incompetent, be sold for nonpayment of taxes, the same may be redeemed at any time within three years after the date of sale upon the terms specified in this section, on the payment of interest at the statutory rate per annum charged on delinquent general real and personal property taxes on the amount for which the same was sold, from and after the date of sale, and in addition the redemptioner must pay the reasonable value of all improvements made in good faith on the property, less the value of the use thereof, which redemption may be made by themselves or by any person in their behalf.

(6) Notwithstanding anything to the contrary in this section, a person may redeem real property under this section without the payment of any outstanding liens for amounts deferred under chapter 84.37 or 84.38 RCW, if such amounts have not become payable under RCW 84.37.080 or 84.38.130.