What happens next?

How to sell your wedding gown
Have the dress cleaned after your wedding.
The delicate fabric can hold onto white wine, champagne, and even perspiration stains that, while not immediately visible, may appear months after your wedding. A dress that has been properly cleaned is much more marketable.
Even if you think you didn't get anything on the dress, it's best to have it cleaned right after the wedding. Old stains are more difficult, and sometimes impossible, to remove without damaging the dress.