Mucus in the back of my throat?

I've had mucus in the back of my throat now for 3 days. I've read loads of stuff on how to get rid of it like lots of water, inhaling steam etc, but it's still there. I've now got a really bad sore throat and it's especially bad at night because i'm thinking about it more. I don't have any allergies or bronchitis. Is there a way to get rid of it, preferably at home right now, that most definitely works?