Recently I found some MLP porcelains at a garage sale & while they are all but mint, they are filthy! These are not normally something I'd be interested in but for the price & condition I just couldn't leave them behind, however, I have never had to clean any bisque porcelain before & I don't want to muck them up! Experienced Pony Porcelain Owners, bestow your wisdom: How can I get years of grunge off these fragile pastel beauties?