Make sure the cleaning company you hire has references that you can verify. Cleaning walls may sound like a simple thing, but it is actually an in-depth process that presents lots of potential for damage or error. If a company uses the wrong chemicals or hires unskilled laborers, then you may end up with damaged walls. If the company has references, then you will be able to learn about the company before you make your hiring decision.

Always get an estimate. Depending on the size and scope of the work you need done, this estimate could be done over the phone or on site. For a simple job, most companies will be able to give you their standard rate and make an estimate over the phone. However, larger jobs will probably require the company to send out an estimator to give you a more accurate estimate.

For large jobs, you will probably be asked to put down a deposit before work begins. Contractors and cleaning companies will normally ask for deposits on large jobs for new customers. You shouldn't be willing to pay more than 25 per cent of the total cost of the job. This amount is more than enough to get any cleaning company working.