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Get to know our team

Owner | Lead Tech. | Rope Access

Mark Stertz started the company years ago, and has been quietly building a team of hard-working individuals devoted to a high standard of service.

Support Tech. | Admin/Sales

Jaime started in the Fall of 2018 and has been a solid part of our team ever since. The sea air off the Sound does not always treat his beard fairly.

Support Tech.

Isiah started in the Fall of 2019 and is an excellent student and worker. He gets a steadier hand by the day.

Field Tech. 
Luis Photo_edited.jpg

Luis started in July of 2020 and immediately showed an admirable work ethic.

Field Tech.

About the company

   MNZ Window Cleaning Services is dedicated to excellent service at a reasonable price while restoring your private or commercial property to that "like new" clean. We beautify our customers' property thoroughly and timely ensuring 100% satisfaction. Based centrally out of Seattle, we work throughout the Puget Sound. 


   Our spectrum of services for residental properties include: window cleaning, roof treatment, gutter cleaning and pressure washing. Commercial clients use our post-construction window cleaning, moss treatment, gutter clearing and hot/cold pressure washing services for their larger buildings (schools, shopping centers, condominiums and offices).  Our main concern for all jobs, whether big or small, is to provide the utmost attention to detail and to exceed any and all expectations.

   Safety always comes first with MNZ Window Cleaning.  We are fully licensed, bonded, and insured, abide by the Washington State Department of Labor & Industries Safety Standards for Window Cleaning, and follow all OSHA guidelines.

    Whether you choose us for pressure washing your driveway or window maintenance of a five story condominium we will always give you our full attention, making sure the job is done right! 

These guys were awesome! They were timely, professional, and did a quality job for a great price! They came out and cleaned all of my windows and my 4 skylights. They even asked me to take a look before they left to show me their work to ensure I was happy. How awesome is that? No rework necessary, but definitely appreciated the validation :) Thanks MNZ, you do great work!

LISA H.  Seattle, WA

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