I installed FTX central to try out one of the demo's from orbx. However, after installing my ground textures get extremely blurry in all areas, is there any way I can remove all scenery and libraries from orbx and ftx central completely?

Regards

You should be able to uninstall the libraries via Obrx Central.  As long as the library entry is no longer in the scenery.cfg it will not be called for.  Did you install the libraries after the scenery as per Orbx instructions?