What foods clean your tongue?

I've heard that certain foods can have a cleansing effect on our tongues, but I'm not sure which ones. Can you tell me, what foods are known to cleanse the tongue and how do they work? Are there any specific nutrients or compounds in these foods that contribute to their tongue-cleaning properties? And is there a recommended way to consume them for optimal tongue-cleaning benefits? I'm particularly interested in natural, everyday foods that I can easily incorporate into my diet.