Removing TM backup from Trash bin
I use TM to backup data from my iMac, and once in a while, I manually delete the backup versions from the backup drive. (I know this is not recommended, but I have done it a couple of times recently). Even after emptying the trash, I notice that these backup folders continue to exist there, and give me messages like 'some unlocked items cannot be removed' and 'operation cant be completed because the item Applications is in use'. While these folders are not occupying any space (20-40 MB), they continue to remain in the trash. Is there a way to remove them permanently?
thanks in advance.
iMac, OS X Mavericks (10.9.3), 21 in, 8GB RAM, i5Core Intel,