Removing Paint from Enamel?
If it was paint from the walls, I'll take a stab in the dark and guess that they used the cheapest possible latex paint to get the place ready to sell.  Try scraping at it with a credit card, starting from the edge of the paint.  

If it starts coming off, use the credit card to pick up a handful of cheap plastic putty knives and go at it. Most latex paints don't stick particularly well to enamel unless it's been pretty severely abraded, and cheap plastic putty knives won't damage it (metal will, or at very least leave marks).