Saline or olive oil is the way to go. I don't think either of those should be used regularly. A flax seed (linseed) tea enema has soothing effects, but the real key with enemas is contact time. The longer the water is in there the softer your poop will be. Try holding in an enema for 10-15 minutes. Go on your back or stomach immediately after insertion to make it easier to hold in.