Clean Hands - Dirty Hands

[Stripes13]

Had this discussion, and would like some other opinions on how to handle this one.

4th Down 8 from B16
A runs sweep to left, and picks up 6-yds. Play is over, then dead ball late hit by defense.

One thought was:
A didn't make line to gain, but the dead ball penalty moves ball to B 5yd line and A has 1st and goal from 5-yd line. The rationale was the defense couldn't get the ball with "dirty" hands.

Other thought was:
A did not make line to gain, ball turned over on downs to B, dead ball foul on B moves ball back to B's 5-yd line, half the distance to goal, chains are set and B starts 1st 10 from own 5-yard line. Clean hands or dirty hands only is an issue if there is a change of possession during the down. A failed to make line to gain...B gets ball and is penalized from succeeding spot since the foul was a dead ball foul.

Who's buying the adult beverages? The dirty hands guys? or the B gets the ball on own 5-yard line guys?