Gconf-Cleaner is a cleaning up tool for unknown or invalid gconf keys for applications stored in configuration system. This tool is quite handy in case you want to remove preferences to specific application listed on gconf applications database.
Install Gconf-Cleaner in Ubuntu 11.04 Natty/Ubuntu 10.10 Maverick
Install Gconf-editor in Fedora 14 Laughlin / Fedora 15 Lovelock
yum install gconf-cleaner
Check other download options and google code page for gconf-cleaner Here.