If you find yourself unable to delete certain folders through your ftp, i found out why. Some of the advanced people may already be aware of this but i just found it out.
In CuteFTP, im unable to delete folders because i uploaded a custom .htacess file for these. If you locate the help page in the ftp section that shows you how to show hidden files, and follow the instructions to enable hidden files, try deleting the folder then
CuteFTP cant delete the folder because that .htaccess file is in it