Using the new admin menu should delete the SK file.
format(str,sizeof(str),"ukadrenalinex/classic/%s.sk",gTrackName);
if(fexist(str))fremove(str);
format(str,sizeof(str),"ukadrenalinex/mtaspecial/%s.mapX",gTrackName);
if(fexist(str))fremove(str);
fremove(gTrackDir);