Looks like you may need to replace most of the old K-Line track. Also noticed you don't have any curve to straight track sections that need to be used with a curve to straight in Super Streets or E Z Streets. Without the curve to straight tracks you may end up with constant derailments at the curves.
I have used rubbing alcohol with a Q-tip to clean my Super Streets tracks in the grooves. A metal wire wheel on a dremel tool will clean most of your Super Streets track but some looks too far gone.
Lee Fritz