Remove meta

I tried and remove your plugin.
But i still have a meta tag on posts :
“feat_slider:”
I look in my mysql i found
a:7:{i:0;s:16:"tagsdiv-post_tag";i:1;s:11:"feat_slider";i:2;s:13:"trackbacksdiv";i:3;s:10:"postcustom";i:4;s:7:"slugdiv";i:5;s:9:"authordiv";i:6;s:13:"member_access";}
in wp_usermeta – metaboxhidden_post

How to remove this ?

http://ww.wp.xz.cn/extend/plugins/wp-featured-content-slider/