Doing it right. Nut Milk Pitchers
This coffee shop is doing it right with separate nut milk and a soy pitcher. Why does that matter? As you may remember, nuts, soy and cow's milk are in the top 8 allergens. This shop is being super careful not to unintentionally steam some cow's milk in a pitcher (not shown in photo) that was only rinsed after steaming some almond milk, potentially contaminating the drink with almond.
Another great workaround is to wash, rinse and sanitize your milk steaming pitchers after each use. We know that can be hard when you are busy, so this might work for you too. It is a code requirement to wash, rinse and sanitize all milk steaming pitchers at least every four hours, not just rinse them all day.