Because we are essentially made of saline, irrigating with anything else is extremely irritating. Salt water, like ocean water, is actually less irritating than fresh water. There is actually evidence that using extra-salty water can help lessen edema and clear out the nose better.
Post-surgical patients often have more success at rinsing out the nasal and sinus passages than patients who have not undergone surgery.
There are many solutions available for nasal rinse and irrigation.
There are numerous products available for administering a nose rinse.
This recipe allows you to mix your own saline rinse.