In a greased crockpot combine cream cheese, american cheese, butter, green chiles and jalapenos.
Cover and cook on low heat for 1 hour. Stir the mixture until well mixed, then add a tablespoon of milk at a time until you reach the desired consistency. Cook for another 15-20 minutes, or until the cheese is completely melted and combined.
Keep cheese dip in crock pot on the warm setting until ready to serve.