Who We Are

At OCS LLC, we're not just here to clean windows — we're here to make your space feel cleaner, clearer, and taken care of. Based in Kalispell and serving Whitefish, Columbia Falls, Bigfork, and the rest of the Flathead Valley, we specialize in residential, post-construction, and commercial window cleaning with a focus on quality, consistency, and personable relationships with our customers.

We treat every project like it matters — because to you, it does. Whether it's your home or a local business, we approach each job with care and attention to detail. We're not about shortcuts or surface-level service. We're about showing up, doing it right the first time, and making sure you're genuinely satisfied.

“Work Done Well, Work Done Right.” That’s not just our motto — it’s how we operate.

What We Do

Residential Window Cleaning

Homes across Kalispell, Whitefish, Columbia Falls, and Bigfork — interior & exterior, screens, and tracks.

Post-Construction Cleaning

Builder-ready finish: stucco splatter, paint overspray, construction debris — removed without scratches.

Post-construction window cleaning in the Flathead Valley

Commercial Window Cleaning

Storefronts, offices, and multi-story buildings on a schedule that fits your business — weekly, monthly, or quarterly.

What They Say

★★★★★

"Highly recommended, fantastic service in all ways; the window cleaning itself and the customer service. Great price as well, highly recommend"

— Jayden Jacobson

★★★★★

"Barrett did a fantastic job on my building, he was prompt, prepared and professional. My windows look amazing, thank you so much!"

— Katerina Robinson

★★★★★

"Barrett did an amazing job on my windows inside and out very polite and very hard-working. I definitely will use him again and I highly recommend him."

— Debbie Turner

★★★★★

"Would definitely recommend and would hire again! I have heard of window washing contractors charging exorbitant fees based on amount of glass of course, but also on the affluence of the neighborhood...rest assured not only will Barrett do a fantastic job, it will be for a fair price!"

— Donna M

★★★★★

"Barrett does a fantastic job at cleaning windows! OCS did my father in laws business and the windows look amazing!"

— Cohen Booth

★★★★★

"Thank you so much for doing such an incredible job! Competitive pricing, thorough job, and very friendly. Will use you guys again and refer you to whoever is in need!!!"

— Darel Handley

★★★★★

"Inside and outside our windows look so clear and beautiful! The job Barrett and his company did to clean our western facing windows exceeded our expectations. Really good communication throughout the project as well. Highly recommend"

— Addie C

★★★★★

"Barrett did such a great job cleaning our windows. He took his time, was very thorough. I would recommend his business to anyone."

— Cheryl Klippenstein