I have soaked the peppers in diet Sprite and taken out the heat (I think after I cut them open...) No clue if it really worked or I just had really mild peppers but they had no heat to them at all.
The other thing you can do it get some of the small salad peppers - they work great for folks who don't like the spicy stuff - made them for my in-laws (who think pepper is "really" spicy and they ate them up.
They looked like this...
