How can I find and delete temporary STMF Files on iSeries?

Our disk storage is being filled with temporary STMF documents(files). How/Where do I find these temporary delete them?

We have Domino 6.0.1 on iSeries. From disk information reports it is clear the about 50% of our disk space is taken by STMF type files. From other postings I understand that these files can be deleted to recover space, but I have searched all over and I cannot find the files although I have the QSECOFR password. I have tried WRKLNK. I have tried the iSeries Navigator. I have tried Windows Explorer to no avail.

I need to delete the temporary files. We are 80% full, and filling up fast.

Please help.