Does the Washing of 1 Corinthians 6:11 Refer to Baptism?

Ken Yates, Bill Fiess, and I have been kicking around the meaning of the three verbs in 1 Cor 6:11. In the NKJV and many translations, all three are given a passive translation. However, the first verb is in the middle voice and the other two are in the passive voice. Ken wonders how we
