IF OBJECT_ID(N'tempdb..#temp_ids', N'U') IS NOT NULL
BEGIN
    DROP TABLE #temp_ids
END
CREATE TABLE #temp_ids
(
    FileGuid uniqueidentifier,
);

INSERT INTO #temp_ids(FileGuid) VALUES(@GUIDS)

DELETE FROM dbo.DocumentStore
WHERE stream_id IN
(   SELECT ds.stream_id
    FROM dbo.DocumentStore ds
    INNER JOIN
    #temp_ids ti ON
    ds.stream_id != ti.FileGuid)