Mexican restaurants in Hampton Roads also serve a "white salsa" that's made out of miracle whip, garlic powder, oregano, milk, and crushed red pepper. Growing up you got a little bowl of each with your complimentary chips. Once I moved out of the area I realized it wasn't Mexican at all and no one else does it.
A lot of places will only give it to you if you ask for it now. But yeah, don’t ask for white sauce outside of Virginia because everyone else will look at you crazy. (Similar to being from Pittsburgh and just wanting some French fries on my salad…)