Hello, The is 20th century crackle ware (Fangge, if it is Chinese). Would need some closeups to decide further, but from the colors and designs it looks as if it were printed, not handpainted. There is a spurious Qianlong stamped mark, only for decoration.
Not sure what you want to clean, but with crackle wares the crackles are mostly brownish in color. They are made to be that way; this means not that the crackles are dirty.