[express]

Hello

I am quite new with Omnifocus for Mac.
I use it on Mac, synchronized with an iPad and ipHone4 over MobileMe.

I am confused about automatic cleaning feature, I don't get how it works.
In Mac prefs, I have set cleaning for Actions with Contexts & Projects.
But when I check done actions (recurrent reportings for ie) they are still there (in grey, marked as done).

How can I keep clean my omnifocus on all devices ? I am not looking for deleting all done entries, but at least older than x months.

Sorry if it has already explained, I am quite lost and I think I am missing a logic here.

And thanks for your support