Best Way To Clean Up Temp Files

I have a custom Data Flow task that creates temp files to the system temp directory during processing. A lot of times, we'll use SSIS to do one data transformation, running and tweaking the package along the way... we do this in the designer ... if we notice something that's incorrect in the data view, we just hit the stop button and fix it. However, when we do this, the Cleanup() function isn't called, and my temp files are left in the temp directory, when they really ought to be disposed of.

Is there a method that gets called every time when the DtsDebugHost quits, whether it finished, didn't finish properly, or was stopped in the middle? What would be a good way (other than having some service that monitors what temp files are used by what processes) to clean up temp files after we don't need them?

~Steve