First and foremost, you'll want to find a company that has experience in cleaning your specific type of property. This means researching their previous clients and getting quotes for cleaning services based on the type of property they're working on.

In addition, make sure to ask about any certifications or licenses the company has that would indicate they are qualified to clean your property. There are many companies available that provide the best cleaning services in Canada.

Another important factor to consider is the size of the team that will be working on your property. Make sure to get estimates for how many people will be working on site and what their hourly rates will be. Also, ask about their availability and whether they can work around your specific schedules.

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Finally, it's important to find out about the company's policies and procedures when it comes to cleaning. Ask what types of items are not allowed in the house during a clean, and what types of rules they have for dealing with broken appliances or furniture.

There are many types of professional cleaners, and each can offer a different type of service. Some cleaners specialize in carpet cleaning, while others can handle all types of flooring. 

Regardless of the type of cleaner you choose, it is important to determine their qualifications and experience. Make sure the cleaner has a license and certification, as well as years of experience. Finally, ask about pricing and how long the service will take.