Most Baptists insist that Baptism in the New Testament was always by immersion: a submerging of the entire body under water.
I've written elsewhere that I think this is incorrect, given the instances in the Book of Acts.
But Mark 7 (4:b, "the washing of cups, and pots, brasen vessels, and of tables") is another example of the problems such folks have.
The word used here ("washings") is elsewhere translated "baptisms." The English "baptism," "baptize," etc. are transliterations from the Greek.
I'm easily persuaded that cups and pots were immersed. But tables?