4 Fire King Vintage Primrose Custard Cups/ Ramekins Scalloped Edge Made In USA

These Fire King cups in Primrose pattern are in good condition. No chips or cracks to my knowledge. There is some staining on two bottoms. And one has a stain on the outside. See pictures. I have only cleaned with dawn dish soap. I heard that oven cleaner can take away these possible grease stains, but have not tried it. The decorations on both sides on all of them is in very good condition.