MacDailyNews Note: How to access your iCloud files from your Mac’s Finder:
1. In Finder app’s Go” menu, choose “Go to Folder…” (Shift-Command-G)
2. Go to the folder: “~/Library/Mobile Documents/”
That’s it, there is no step 3.
kirkmc adds, “If you move a file from one of these application folders to the Trash, you’ll see a dialog informing you that this also deletes them from iCloud, and asking if you’re sure that you want to delete them.”
More info via OS X Hints here.