About 5 to 6 month ago I sprayed something like WD40 or similar stuff (I suppose) into the frame and forgot to let it dry before I put the seatpost back (didn't take the BB off when I sprayed that stuff in). Then a couple of days ago when I remember about the whole thing I put the frame upside down and to my horror that stuff was still in its liquid form and coming out of the frame. And there're already some rusts inside.

What should I do? Should I just use frame saver and remeber not to repeat my stupid mistake? Or should I use WD40 first to get rid of the rust then frame saver?