Stolen from a friend:

A friend who works at #starbucks posted this: PSA to anyone with a #treenut #allergy who frequents starbucks. We have a new drink called the pistachio cold foam cold brew and our pistachio sauce not only has real pistachio in it, the syrup sticks inside the blender and will 100% not fully wash off with the rinsers we use. I suggest if you want a cold foam drink during Jan-March you request it done in a sanitized blender.