I've been a customer for 3 years, and counting.
We are a dry cleaning business and we use Heirloom Oriental Rug Cleaning to clean rugs for customers who need the service. It comes down to our confidence in them to do a good job. We wouldn't use their services for our customers otherwise.
We toured the facilities and saw their work processes and the state of the art equipment they use. It was clear to us they had the equipment to do the proper job for a variety of rugs. That's what put our trust in the company.