There was only one man who was righteous in his eyes, and it was Noah.

God said to Noah, Noah, I want you to make a big boat because I’m going to wash the earth clean of all that sin, and Noah in faith built that boat, and when he was finished, he went in with his family, and God sent a flood.

God washed all the sin from the face of the earth.  This is a strong picture of baptism, where the water washes away all the sins, and man is saved by the ark, which is a representation of Jesus through the water.