Ahh I think I had it mixed up, in the states at least rice contains a lot of heavy metals so when my son was young we avoided giving him too much rice, which was difficult since basically every kid snack is rice based.

A quick google search says washing it ‘could’ get rid of some of those metals, but not really. Makes me feel a little better about not ever washing my rice but it does cook a lot nicer after washing which makes sense.