Our team members are the best in the industry. We are proud of what we do and what we represent. Honesty, integrity and a positive self-image are characteristics of each and every team member. Teamwork and looking out for one another’s well-being is how our work environment thrives. From the time an employee steps through our doors they will be required to undergo intense and comprehensive training, ensuring compliance of all Cal-OSHA, EPA and safety regulations. We train and retrain, resulting in an accident free safety record since 1989. All team members must complete the continued certification programs throughout their employment. West Coast Maintenance continues to be a positive influence in the lives of our staff, their families, our community and the industry.
All West Coast Maintenance team members are full time employees and as such are fully insured. To help retain quality personnel, we offer many incentive and bonus programs as well as a comprehensive benefits package.

Christopher H. Mehl


Chris founded CHM Window Cleaning in 1987 with the idea of providing quality commercial window cleaning services for southern California. Since day one, Chris has actively maintained a hands-on role in operations, business development, and strategic planning. His vision and philosophy was the guiding force behind the growth of CHM and in 1989 West Coast Maintenance, a full service professional company was created to take window washing to the commercial market as trained professionals. In 2017 Chris stepped down as General Manager and is turning over control of WCM to Ms. Mari Guzman the new General Manager and Captain of West Coast Maintenance.

Chris will continue to work for and advocate safety within the industry through his new company Façade Equipment Inspections Services. He is actively involved in BOMA (Building Owners and Management Association), SAIA (Scaffold and Access Industry Association), IREM (Institute of Real Estate Management) and the IWCA & ANSI/IWCA I-14 (International Window Cleaning Association) safety standard.

Mari Guzman

General Manager

Mari joined West Coast Maintenance in 2000 and brought with her an extensive background in administration and project management. This experience has given her an edge with regards to client quality service, scheduling, team building and problem solving. As director of operations, Mari oversees all three divisions: window cleaning, pressure washing, and metal maintenance. She is also responsible for scheduling, client outreach and education. Mari is safety certified by the IWCA, SIA and ISSA and is responsible for our in house safety training and certification program. Mari has completed her Bachelor of Science degree at California State University Long Beach and is currently working on her Master’s Degree. In 2017 Mari was promoted to General Manger to continue and improve those ideals that started West Coast Maintenance almost 28 years earlier.

Carmen De Rossi


Carmen has been a valuable team member of West Coast Maintenance since 2003. Carmen’s extensive experience includes financial management responsibilities with real estate investment firms and several years as senior auditor for an international public accounting firm. Her responsibilities at WCM include management of all corporate budgets, accounting and growth related financial advice. Currently, Carmen is also involved with volunteer consulting for an educational institutes’ fund raising.

Ulises Aparicio

Operations Manager

Ulises joined our team in 1994. Since then he has worked his way through the ranks to meet all the challenges and growing demands of our clients in coordinating services, and deploying our crews. West Coast Maintenance grew into the full service provider it is today with the help of Ulises and the operational division.His responsibilities include training field supervisors and area supervisors in safe and proper cleaning practices. He is also responsible for meeting with clients, scheduling crews and oversees all nightly cleaning services. Ulises is currently working on his Associate of Arts degree at Santa Monica College.

Freddy Cornejo

Field Supervisor

Freddy joined our team in 1997 and since then has worked diligently to meet the challenging and growing night cleaning demands of our clients by deploying our onsite crews. West Coast Maintenance is very fortunate to have such a dedicated and hard working crew member as Freddy. His responsibilities include training and managing site crew members in safe and proper cleaning practices. Freddy is one of our floor specialist and is also responsible for leading crews in project work and following up with clients. Freddy is taking classes during the day at Los Angeles Career College.

Miguel Rosas

Operations Manager

Miguel began his window washing career with West Coast Maintenance in 2001. Miguel is a true leader and with his hard work and continued education he has become field supervisor for the window washing division. He works consistently to meet the challenges of our clients, coordinating services, deploying our window washing crews as well as training in proper and safe cleaning practices. He enjoys the family type environment and satisfying our clients by creating a solution for any problem that may arise. Miguel is currently going to night school at El Camino College.  In 2017 Miguel was promoted to Operations Manager assisting in the daily operation of all window washing and other services that West Coast Maintenance provides. During Miguel’s 17 year career with West Coast Maintenance he has become a important part of the WCM family.

Felipe Rosas

Field Supervisor

Felipe began his window washing career with West Coast Maintenance in 2003. Through his hard work, dedication and educational achievements he was promoted to Field Supervisor for the Window Washing Division. Felipe has completed his education as a high rise, low rise and boom equipment expert. He is completing his Certification for High Rise Specialist through the IWCA ANSI I-14 program. He continues to work to meet the challenging demands of our clients, coordinating services, deploying our window and pressure washing crews as well as training in proper and safe cleaning practices. He is very eager to solve all of our client’s unique challenges and problems that may arise.