Question:
If you dip celery into a yogurt- or milk-based dip, like a blue cheese dressing, do you have to wash first (without a brocha)?
Answer:
For those people who are careful to wash before eating davar shetibolu bemashkeh, this would also be considered something to wash on because it is milk based. Additionally even though milk water and wine congealed it will still be considered like a liquid, in this sense.
Sources:
O”C 158- 4, M”B 158 16