Sometimes, Wise Disk Cleaner can not delete some files.
That is normal because these files probably were being occupied by some applications, and they will be deleted next time when you reboot your computer again.
Another situation, Wise Disk Cleaner can not delete files even you have restarted your computer.
That is because temp files can be created automatically at any time and the names of the new temp files may be the same with the previous ones,so it seems that some files can not be deleted .