Using the Grossan nasal/saline irrigation system provides more effective irrigation rather than using a typical bulb syringe or spray bottle. Essentially this is a Waterpik machine (for dental health) with a nasal adaptor attached. You can find it all over the internet, or you can order it from an allergy control supply store such as this one.
You can order the pre-made saline solutions or make it yourself for pennies with this recipe.