Trying to find process colors (CMYK) in a file that shouldn't have any...

I work in prepress. I have an Illustrator CS6 file that is made up of 3 Pantone Spot colors. I save the file as an eps from Illustrator and rip the file with our prepress software. When previewing the ripped file with our prepress software it shows me that I have process colors (CMYK) somewhere in the file. I can not see these colors visually in the ripped file so I go back to Illustrator to see if I can edit them out of the file. I use the Preview Separations tool but can't find those process colors anywhere. There are no placed images, everything is vector art. I double check any white color and make sure it doesn't have any tiny percentage of process color in it. I make sure my spot colors are indeed spot colors and not process colors. I add used colors, I delete unused colors. I can't find the CMYK being used anywhere in my Illustrator file. Any thoughts on how to clean up these "hidden" colors? This was also a problem in CS3. I'm using an iMac 2.5 GHz Intel Core i5, Mac OS X, Version 10.7.5 Thanks for any help!

I've done all you said, John, but still get the process colors appearing, just not visible. It could be a rip problem; it only happens ocassionally. I am able to exclude the unwanted colors when I rip the file but I was hoping to clear them from the start in Illustrator. It doesn't help that the Preview Separations tool ALWAYS includes the CMYK process colors even if there aren't any being used in the file. I wish Adobe would change that. Anyways, I'll continure on... I appreciate the help and if anyone else has any ideas, please feel free to add them.

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