There's no such thing as a "garbage collection" module. Perl does its own garbage collection using reference counting and if something's getting lost there's not much you can do about it (aside from fixing the leaky code).
If you can't find and fix the leak you'll probably have to fork() a sub-process to do whatever leaks, pass the results up to the parent via a pipe or temp file and then exit() the child. When the child exits any memory it used will be reclaimed by the operating system. I've used this technique before with leaky Perl modules. Give it a try and post again if you have trouble.
PS: The above suggestion assumes you're working on a Unix system. I imagine things are different in Windows-land, where fork() is emulated with threads and exit() probably doesn't free memory.
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