Disk Cleanup Not Cleaning Ext. HDD Recycle Bin

I ran disk cleanup and selected my external hdd and selected the recycle bin.
After 10 minutes disk cleanup closed. But, the Recycle bin still has the files in it.
I manually cleaned the recycle bin and it took 2 minutes.

Am I missing something with Disk Cleanup??

James

I selected it form the disk cleanup's drop down which shows my drives.
And there wee 2 items and both were checked. One was the Recycle Bin.

I removed something I deliberately deleted, now.
Seems ok.

Before, there were these odd looking files and folders with long names and numbers. Not sure what they were, but I deleted them.