That gives you 17.
Bonds, Clemens, Schilling, Walker, Jeter,
Rolen, Ramirez, Jones, Helton, Sheffield,
Pettitte, Abreu, Sosa, Kent, Giambi,
1) If the HOF or MLB doesn't want me to vote for those players, then don't include them on the ballot.
2) I have a hard time assuming that we can neatly divide players into clean or dirty based on public info, so I choose not to.