Hidden Valley Salad Dressing

1 1/2 teaspoons garlic salt
1 1/2 teaspoons onion salt
1 teaspoon parsley flakes
1/2 teaspoon Accent?
1 pint mayonnaise
1 cup buttermilk
8 ounces sour cream

Mix all ingredients together. Use on green salad, baked potatoes, or as a dip.