Search how long they have been in this field
Because the company we are trying to reach must be a professional one and must have an experience about 10 to 11 years. Because house cleaning is not that task which we can let handle to an unprofessional company. You should take a look on their cleaning machine are they modern or efficient or not and should also interview them to know they are well trained or not. We should make ourselves aware of the available companies in the market. Ask if they guarantee their services or not like are they giving you guarantee that if they can refund you when you will not satisfied with their work?