Unison file problems

[PACPhD]

I seem to have filled and possibly corrupted my Unison cache files and can't find them to delete them. I can no longer delete the cache files from inside the program and a search (even with spotlight) has not found anything. I have reinstalled the program a number of times and there are files which automatically restore the cache, install serial number, etc. I even unhid all files and that didn't help. Does anyone know where the files are installed and what their nemaes are?