Imagine having a wide office and shop space. If you have a building and a garden or yard to go with it, there would be many areas and many specialized cleaning required. You have an option to get individual cleaning companies for every area. But then it would be most beneficial to hire just a single company for your cleaning needs. 
When you have to hire 2 or 3 cleaning companies the work is doubled and tripled. When you have problems with each, it would be 3 companies that you would have to contact. On the other hand, if you only hire a single cleaning company, you only have to talk to a single company. There's only one company to pay and there's only one company to call when there is a problem.
By hiring a single cleaning company, you will have a company who will know all your cleaning needs. They would even be able to anticipate your additional needs. If you have built a good relationship with them, they would even be able to advise you as well.
Since doing business in volume usually warrants better deals, it is really most advisable to hire a single company only. The cleaning company would give you discounts just so they can add business with you.
All in all, not only is it more convenient to hire only a single cleaning company, it's practical as well. It will usually lead to savings too. So again, when it comes to hiring cleaning companies, it is better to hire a single company. But make sure that you hire a cleaning company that offers a complete line of services.

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