When I was getting treated at National Jewish (Respiratory Hosp In Denver) they are real big on Saline Sinus rinses. Its kinda gross to do it but it makes a HUGE difference. (specially for those with allergies) Link to Kit
Best part is that this does not cause any nasal damage, and cleans a lot of irritants out of your sinuses...
Best decongestant
They do work, but they are far from fun. If you are an allergy sufferer, it will flush all the yuck that you have in your sinuses out, and usually allow a better nights sleep. I am *supposed* to be doing them twice daily, but even with the few times a week that I am doing it It makes cpap usage much easier. Also, I don't get the glob of stuff working its way down my throat... (yech!)