ZTE Blade L5 root issue

hi everyone i manged to root my zte blade l5 with kingoroot just to test a few things.
but then i decided to remove root access but some of my apps now dont work kingo root left residule files behind and i cant delete them i have rooted it again with kingoroot and tried again but no success in removing it
the files left behind

/system/xbin supolicy and daemon
how can i remove them files or remove the root.

never had this problem b4
*note its still stock no custom rom

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