Clean custom folders

CCleaner for Android
1

How do I add a custom folder to clean? The custom files/folders option seems to only let me pick individual files to delete not folders to empty.

2

Have a read here Amtrak7

http://www.piriform.com/docs/ccleaner/using-ccleaner/including-files-and-folders-for-cleaning

3

I'm referring to CCleaner for Android.

4

My error Amtrak7.

I must clean my glasses more often :)