Yes, but when I do, it says: "The operation can’t be completed because it isn’t supported."
I had the same problems.
But I worked out using a BootCamp partition with Win7 x64.
When I encounter this problem in my Mac, I simple reboot in Windows.
The deleted files aren't in a "trash bin" or anything else.
Just let Windows shows all the hidden files.
In the top of the list of the files/folder of the drive, you'll see a folder names .Trashes.
Go inside and you'll see another folder named 501.
This folder contains all the deleted files from the Mac of that drive.
Just delete all the files and you are done.
I tried this in Lion and Mountain Lion.
Hope this will also works for you.