Cannot permanently delete certain files

I have this recurring problem where certain files can't be removed from my bin: > The Finder can’t complete the operation because some data in “0000” > can’t be read or written. (Error code -36) I'm pretty certain that the problem is related to the '*online-only*' feature of Dropbox. E.g. me deleting files that are in the cloud rather than stored on my hard drive. I think the only way I could delete them would be to first restore them to their original folder, sync them with dropbox and then delete them again. Surely there has to be a better way?