find . \( -name ".DS_Store" -or -name ".Trashes" -or -name "._*" -or -name ".TemporaryItems" \) -print
Check if the print is correct. When the file can be deleted. replace '-print' with '-delete'
Prevent ._ file creation (samba config)
[share-name]
veto files = /._*/.DS_Store/
delete veto files = yes