We have a utility that we run on every "finished" job so we do consume necessary space. Among other things like removing intermediate transform files etc we run $ENV{'XYV_EXECS'}/bin/divcollct -cd $divpath on every division in a job (this is run from a job tool).

Indeed like Chris said, the divcollct utility is what you are looking for.
Here is what xyhelp divcollct has to say about this handy tool:

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DIVCOLLCT is an application, run from PathFinder or from the
command line, to clean up a division by eliminating some or all the files
associated with previous sessions. Command line options are:

divcollct With no arguments, removes all files associated with all
sessions except the current session.

-cd divpath Directory path name of a division.

-a# Retain the current session and # backup sessions. Use any
large number (e.g. -a99) to retain all backup sessions
and merely remove all temporary files known to divcollct.

-d Remove all sessions INCLUDING the CURRENT session
(Use with extreme caution! Everything goes!)

-xsh Turn off verbose progress messages, as if from PathFinder.
The program title and exit messages are suppressed.

Exit Status: 0 = Successful completion.
-1 (255) = Fatal exit, program aborted.

See Also: xyhelp divsess
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Thanks all. It helps!