Since Brendan saw this on my blog and asked for it, here you go:
Runs "MsiZap G!" as the credential user (you did set a credential, right?) to clean unneeded files out of the Windows\Installer directory.
This requires a couple of things. One, you'll need MsiZap.exe. Two, if you want to do what I did, which is to get a PDF-formatted report after your "MsiZap.exe G!" process is run, you'll need text2pdf.exe. Oh look, they're both in the ZIP file.
Mind you, you'll have to edit the procedure to match up with where you store the EXEs on your K-server, which I doubt will be just like how I store files on mine.
Use it in good health, lads and ladies...