Warm the milk in the microwave for 1 -2 minutes. Grate the cheeses and crush the garlic. Melt Butter in a large saucepan on medium heat. Add flour and stir together. Let cook for 2 minutes and then add milk and whisk until smooth. Adjust heat and bring to a simmer. Add crushed garlic, cheeses and seasoning and whisk smooth until smooth and creamy adding a little more milk to thin if the sauce becomes too thick. Only add salt after tasting as the chees and butter contain salt.