I have made cheese sauce before and it has never been sweet. No problem with butter and flour and then I added milk like before. White sauce was fine. So I added cheese. Yes it was a package of shredded sharp cheddar cheese from Harris Teeters. I know fresh is better but it was what I had. The sauce itself was fine, smooth and creamy, but it was sweet. I used skim milk and I have used packed cheese before but it has been a while. Is it the cheese? Have they added something or is it the skim milk?