RE : How do i delete mongrel temp file after upload complets

Hii all,
         In my rails application am uploading some large file(1 Gb),and
when i go windows temp folder ,mongrel temporary files are gathering
there,but i would like these files to be deleted after upload
completes,eating
                                  Could anyone tell me how do that??

this is my ruby version:
ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]

Thanks..