In the first place, we would like to stress that Muslims are allowed to eat the food prepared by any human being as long as it is clean, healthy and prepared with halal (lawful) ingredients. With this in mind, there will be nothing wrong, in sha’ Allah, with the food we eat as long as the people who prepare the food do clean the kitchen utensils. It is practically different to have Muslim utensils inside the company or western restaurants, and based on this Muslim scholars state that it is permissible to use the plates and utensils which was previously used in serving haram food and drinks as long as they are properly washed in a way that removes all the traces of the haram food or drink.
Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states the following: Our religion is simple and natural, and teaches us to deal with all people fairly and justly; halal is halal and haram is haram regardless of whether it is provided by a Muslim or a non-Muslim. The laws of Allah do not discriminate among people.
It may be illuminating to know that the Prophet (peace and blessings be upon him) and his companions used to eat food that had been prepared by their pagan relatives and friends; they only avoided those foods which are forbidden in Islam.