Preheat the oven to 350°F (180°C).
Generously grease a 9½-inch (at least 10-12 cups) bundt pan with oil spray or butter. Set it aside.
Add vinegar to the milk, stir well, and set it aside. It will be our DIY buttermilk.
Sift together flour, baking powder, baking soda, and salt. Whisk well for at least 30 seconds.
Take melted butter and sugar in a large bowl. Whisk well until everything is well combined, and the mixture is smooth.
Add orange juice, orange zest, orange extract, and vanilla extract. Mix well to combine.
The mixture will curdle because of the orange juice. But that is perfectly fine; later, everything will combine well.
Add dry ingredients in two parts, alternating with DIY buttermilk (a milk and vinegar mixture). Mix only until everything is incorporated. Do not overmix.
Pour the batter evenly into the prepared bundt pan and smooth the top with a spatula.
Bake the cake for 40-50 minutes or until the cake tester inserted in the center comes out clean.
Because every oven is different, keep an eye on the cake after 40 minutes of baking time.
Remove the pan from the oven and transfer it to a cooling rack. Once the cake is thoroughly cooled, invert the cake onto a cooling rack, cake stand, or serving dish.