In-N-Out Burger actually did this over a year ago
It did not just promise a cleaner menu. It changed the ingredients in foods people already order.
Yellow 5 is out of the pickles, chilies, and spread, replaced with turmeric. Red 40 is out of the Strawberry Shakes and Signature Pink Lemonade, replaced with beta carotene and vegetable juice.
High-fructose corn syrup is out of the shake mix, strawberry syrup, spread, and pink lemonade. The ketchup is now made with real sugar instead.
That matters because you can keep ordering a familiar favorite and get ingredients you can actually recognize.
Lets give credit where it is due. When a big chain follows through like this, it is worth noticing.