Clearing out stale cache data
At this point, we don't ship anything to help you with this.
On linux and Mac OS X sites, a good start is to run a cron job every so often that removes old files. For example, you might schedule this command line to run every 15 minutes to remove any files that have grown to be 2 hours old or older:
find cachedirectory -mmin +120 -type f -exec rm {} \;
