Sync Storage Not Releasing

I accidentally got Sync working when I mapped my "My Documents" to a shared network folder on my server. I've since disabled Sync and told it to delete all off-line files, but Windows Explorer still shows 120 GB of "C" being used when in reality I only have 26 GB. I've rebooted twice after turning Sync off and deleting off-line files.

Any ideas how I can free up that space? I can find no hint of it anywhere, except in the free space report in Explorer.

Thanks for the help. I found the answer myself.