How to clear mucus/phlegm from throat/nose?

Okay so I have some mucus/phlegm stuffing my nose, and my throat. Any REAL way to clear it? Claritin doesn't help...and I tried pills before, but nada. Besides drinking lots of water to hydrate the throat, is there anything else that might help? I want to feel clear and fresh with no mucus blocking my sinuses/throat.