deleting from the bsu cache_dir

Metalink Note 2271366.1 is about performance issues with BSU.SH, a 10.3.6 WLS patching script.

The full info in point number 6 of that document is:

"Older PSU's that are no longer in use may be deleted from the bsu cache_dir. This can further speed up some processing."

That's a rather unclear statement, for an action that is very delicate ... Like removing files.

I know where the "cache_dir" is, but I'm left with the technical translation of "Older PSU's"

What exactly is that ? Only the JAR files ?

Or, everything in there ?

Can I:

rm -rf cache_dir/*

or

rm -f cache_dir/*.jar