Cleanliness is an important factor in any restaurant's success. To ensure a safe and healthy environment for customers, restaurants should regularly (a couple of times a week) use a professional cleaning service to keep their premises clean.   Depending on the size of the restaurant, the frequency of cleaning should vary. Generally speaking, it is recommended that restaurants use a professional cleaning service at least once every two weeks to deep clean their premises. This helps to maintain a high level of hygiene and prevent the spread of germs and bacteria.