The 7 Cleanest Fast Food Chains

Which of the popular chains have the cleanest fast-food restaurants? That's a good question that many Americans want to know the answer to or already have an opinion about. The fast-food industry is booming and many brands are scrambling to clean up their act — literally.

Eager to determine which of the top fast-food chains had the cleanest restaurants, Business Insider polled more than 3,000 customers to find the answer. The report, released on Tuesday, listed Chick-fil-A, In-N-Out, and Starbucks as some of the top choices. On the opposite end of the scale, McDonald's, Burger King, and Subway only received a 10% vote of confidence.

To answer the burning question of which chains have the cleanest fast-food restaurants in America, we look at the top 7 as listed by Business Insider based on their customer poll:

7. Whataburger. 11% of people surveyed said Whataburger had the cleanest restaurants.

6. Chipotle, 15%.

5. Culver's, 20%.

4. Panera Bread, 21%.

3. Starbucks, 27%.

2. In-N-Out, 30%.

1. Chick-fil-A, 55%.

• 9 Things to Never Order in a Restaurant
• Favorite Mexican Food in US is Taco Bell, Poll Finds