Is there any way to eliminate or reduce moiring of a clip in Vegas? I need to lower the detail setting on my HD cam to prevent this in the future, but I have some clips already done that exhibit moiring and can't be re-shot.

There are some things. First, you might try turning on "Reduce Interlace Flicker". Then you can add a slight blur to the clip if you need more. Depending on the final destination, rendering as progressive might help.

Try a small amount of Gaussian Blur.
Adjust Horizontal to 0.0
Adjust Vertical at 0.001 to 0.003

I'll give those suggestions a try and report back -- thanks guys!

That worked guys! Thanks!

Out of curiosity, which suggestion did the trick?

The gaussian blur seemed to be the way to go with this. I used the settings you suggested with .003 for the vertical. I also did change the reduce interlace flicker setting as Ed suggested, but it did not seem to have much of an effect if any that I could see. There was some minor loss in quality but the clip is much more usable than before -- the moiring was very obvious. I was using an EX1R with the factory default settings. I need to use a profile with the detail setting reduced which I intend to do in the next day or two. I have one that a friend provided me with so I'll try it for now. There are several available here on the forum. This forum has been a GREAT source of help and information. Thanks again, guys!

Thanks for the update Tom.
It will come in handy if someone is searching for a solution in the future.