.Trashes folder on USB won't delete

The '.Trashes' folder is for OS X to remember that you moved files to the Trash but haven't deleted it. To remove the files from the '.Trashes' folder you need to empty the trash.

You can empty the trash by right clicking on the trash can in your dock and selecting 'Empty Trash'.

To avoid having to go via Trash you can do the following

• Open Terminal (in /Applications/Utilities or via Spotlight)
• Type rm followed by a Space (or, if you want to delete whole folders that way, type rm -r followed by Space)
• Drag all the files you want to delete from Finder into the Terminal window (release the mouse after the green + appears)
• Press Return

I resolved this issue by simply emptying the trash on my computer.

The .Trashes folder also emptied on my pen drive, in doing so.

Hope this works for others.

R