Where to bring gown to be cleaned?

Hi Ladies. My SIL got married last Saturday and I have her gown and need to get it cleaned. (she is on her HM) Any suggestions on where to bring it?
I am in Huntington but will travel along the north shore into Nassau If I need to.
Need to do this asap too because at the end of the night somone dribbled chocolate all over the back of the gown!!! Be careful with those chocolate fountains ladies!