Which power cords help ameliorate digital glare/grain/digititus?


Do power cords make a difference in ameliorating digititus? If so, which component most benefits, cd transport, dac or integrated amplifier? Which component is most likely the cause of it? Which cable?
pmboyd
To clarify, I'm aware of cables reputed to address the issue, but I'm interested primarily in hearing from people who have a broad range of personal experience.
Aftermarket power cords cannot improve sound quality, but they can be made in such a way as to mitigate EMI whilst delivering sufficient current to the load.