Douching is supposed to be bad for you, it can upset the natural P.H. Balance and damage the natural bacterias in the vagina.

However when I had a colposcopy done and explained to my doctor that their seemed to be skin sloughing off and the iodine was taking a while to flush out all the way they told me to douche.

I guess you can do it occasionally when it is desperately necessary but it is not recommended to do it regularly.