Vtg Gold Castle Tea Set

Vintage Gold Castle ChikUSA ceramic tea set. Handpainted. One side is a fruit basket & the other side is a floral arrangement. Iridescence white paint. The paint it worn down in spots. There are stains on the bottom of the teapot, creamer and sugar bowl. I don't know how to remove the stains or if they can be removed at all. The sugar bowl has a large crack in the middle. It's a beautiful set for use or to be displayed. The kettle measures about 8"x7" Creamer: 3.5"x4.5" Sugar bowl: 3.5"x5.25" Cup: 2.25"4.5" Saucer: 5.5"