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Immigrant to Industry Icon: Our Story

commercial-office-cleaningIn 1959, Irish-born immigrant Carl Shanahan Sr. reached American shores with $2.50 to his name, and dreams of new opportunities and prosperity for his family. The Shanahans settled in Stamford, CT. and Carl soon found work, first with Pitney Bowes and then CBS Technology, successfully establishing a professional career and family roots.

The entrepreneurial spirit captured Carl’s imagination as Stamford entered a period of economic growth, attracting corporate giants like Xerox, American Thread, Champion International, American Tobacco, General Electric, GTE, Union Carbide, Fortune Brands, Oxford Health and others. The time had come to start his own venture.

Building on his vision of serving the large and growing cluster of corporate headquarters, Carl prepared to launch a cleaning company. He shared a list of ideas for naming the business with twenty co-workers who unanimously voted to honor his Irish heritage; the Shamrock brand won the day.

In 1969, Carl’s company landed Xerox’s new HQ as an anchor client and by the early 1990’s, Shamrock was servicing over 80% of the corporate headquarters in Fairfield County. During this period, Carl Jr. and brother Kevin joined the family business, continuing to build and expand resources and geographic range, driven by a reputation for integrity and service excellence.

With additional corporate offices in St. Petersburg, Florida, Shelton, Connecticut, Boston, New York, Philadelphia, and Wilmington, this family-owned commercial office cleaning company, now Shamrock Clean, continues its decades-long record of dedication to employees and client-partners.

From our humble beginnings in the 1960’s, to a national commercial office cleaning service provider in the 21st century, we look ahead with gratitude, humility, and a ubiquitous commitment to excellence.


ShamrockClean has been offering quality commercial cleaning services since the late 1960’s. The growth and success that have distinguished ShamrockClean from our competitors are the result of our fondness for this industry, loving what we do and working hard to do it well.

At ShamrockClean, we are committed to serving our customers beyond their expectations. We do our best to provide reliable service and consistent quality. We believe we can provide you with the best value for your dollar. And our philosophy is working; today, over 800 ShamrockClean employees proudly serve clients with over twenty million square feet of space, every day.


If you are a ShamrockClean customer and have a story about our service that you'd like to share, please submit your story to us via our contact form on the Contact page. We will publish your feedback on our website and extend one-time special pricing to you as our way to say "thank you" for choosing ShamrockClean as your commercial cleaning company of choice!
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Why Choose Us

  • Quality

    We love what we do, and it shows. Each of our over 800 employees have been specially trained, not just in the job they do, but how to treat customers. The result is a quality experience for you, start to finish.
  • Honesty

    Lots of cleaning companies out there say they'll do one thing or the other and give you a flat rate, and you find out the hard way that that isn't good business in our industry. We take time to understand your needs and tell you exactly what you need to achieve your desired results.
  • Transparency

    We don't hide our costs or pad them in fees that pop up last minute, or that are suddenly showing up as "extras". We are transparent on our pricing and our process so you know exactly what you are getting.
  • Customer Service

    No relationship with a client is complete without excellent customer service. We could be the best cleaning company in the world but if we don't make you feel like your the best client in the world, you won't be satisfied. We strive to make every client feel like the only one we have.