How do I find where an effect was used?

Hi -

I'm running AE CS6 (on MBPro OS X 10.7.5) and I just re-opened a file made with AE CS4 that uses some BCC plug-ins which I haven't re-installed in CS6. I got an alert that some effects were missing from the project.  I'd like to find out where the effects are used in the project so I can delete them and end the alert message's reign of terror.  Is there a shortcut way of doing that or must I hunt through every layer manually?

TIA your advice,

JL