I have used it for many contest leading right up to the show. I am one of the lucky people who does not need a harsh diuretic, I tried lasix only once and that was a bad idea. I prefer Aldactone or Aldactazide, something very mild. I have even used Taraxatone.
Anyway, Anadrol keeps me incredibly full while dieting, and helps keep my strength up....very important so I don't crash in weight. I might add that I have also never, ever used an anti-e, again I don't carry water much when my diet is spot on.
It can be done but it is best left for trial and error by the individual since each person will respond differently. Best thing to do is try it when you hit about 6-7% with a clean pre-contest diet. Then you will know how the water hits you.