Crockpot Party Mix

3 cups thin pretzel sticks
2 cups Wheat Chex
2 cups Rice Chex
4 cups Cheerios
1 (13 ounce) can salted peanuts
1 teaspoon garlic salt
1 teaspoon celery salt
2 tablespoons grated Parmesan cheese
1/4 cup melted margarine

Mix ingredients in bowl. Sprinkle salt and cheese over ingredients. Then pour butter over all. Cook in crockpot on LOW for 3 to 4 hours. Uncover crockpot for 30 minutes of cooking.