One of my syringe's was too soft to be of any use and the other one was the old fashioned kind and was too big and strong. I think I may have once managed to get anything out of DD's nose with either one.

For decongesting the sinuses:

One option is taking a really long, hot, steamy shower. This loosens up everything and four or five good nose-blows clears your sinuses quite nicely.

If you prefer over-the-counter meds, Ibuprofen will often help relieve the swelling of the nasal tissues bringing down the inflammation and pain.

If you prefer homeopathic rememdies, I use Pusatilla 30C. It takes care of my congestion beautifully. Check with someone who knows to see if this or another homeopathic remedy would work best for you.

Also, applying hot packs to the sinus areas can help, followed by a sinus massage. A warm washcloth works well. For the sinus massage, I rub all around the base of the nose, the cheeks, around the eyes, and behind the ears. Sometimes gently pulling on the ears (out and down) helps drain things in the back of the nose/throat.

And finally,

"Sip chicken soup. A long-time folk remedy is now a proven fact. A cup of hot chicken soup can help unclog your nasal passages. Researchers at Mount Sinai Medical Center in Miami Beach found that hot chicken soup, either because of its aroma or its taste, "appears to possess an additional substance for increasing the flow of nasal mucus." These secretions—what comes out when you blow your nose or sneeze—serve a first line of defense in removing germs from your system, the researchers say." from MotherNature.com.
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"If you want your children to be bright, read them fairytales-- if you want them to be brilliant, read them even more fairytales" Albert Einstein