Vintage Imari Hand Painted Dish

It’s a beautiful Porcelain bowl Diameter of 7.5 inches There’s staining of reddish tint on the bottom of the dish The rim on the bottom is very dirty probably due to years of ussage, I do not want to risk damaging the plate trying to clean it There is no visible chips in the painted part of the dish, there’s a very small chip on the bottom part of the rim that the dish sits on.