Aaron Muller, CEO
Aaron Muller has been in the truck washing business since 1989—long before it was trendy, automated, or talked about online. He started in the trenches, washing trucks by hand, learning what actually works in the real world: how to clean faster, safer, and more consistently while keeping fleets on the road and compliant.
Over the past three decades, Aaron has built, scaled, and operated successful mobile truck washing operations across the Pacific Northwest and beyond. His focus has always been simple—deliver dependable, high-quality fleet washing at a price that makes sense for customers and still allows the business to thrive long-term.
Aaron understands fleets because he’s worked with them for decades: box trucks, semis, delivery fleets, service vehicles, and specialty equipment. He’s seen every mistake in the book—bad chemistry, slow processes, poor training, and non-compliance—and has built systems that eliminate those problems. Efficiency, repeatability, and accountability are the foundation of how Mr. Truck Wash operates.
Today, Aaron continues to lead Mr. Truck Wash with a hands-on mindset and an old-school work ethic, backed by modern equipment, proven systems, and experienced crews. The goal has never changed: wash trucks better, keep customers for the long haul, and run a business that lasts.
Mayumi Muller, Vice President
206.250.5528
mayumi@mrpressurewash.net
Mayumi is an accomplished entrepreneur who is passionate about our planet. She believes sometimes the best way to save the environment is by paying attention to the dirtiest jobs. Washing trucks is not something most environmentalists think about, but improper washing techniques can cause grease, oil, and heavy metals to enter our storm drain system, which feeds into our streams and lakes. Mayumi loves educating potential clients on the benefits of our proprietary water recapture system and eco-friendly cleaning process. She is proud to be an environmental pioneer in the truck washing industry. When she is not leading a company of 50+ employees, she enjoys cooking, traveling, and spending time with her family.
Gary Oswold, Operations Manager (Truck Washing Division)
206-595-8753
gary@mrpressurewash.net
Gary joined us at MTW just after the company’s inception in 2008. He left an 18-year position to join the team because he believes in the company’s eco-friendly mission. “I call it next generation washing,” he said of the recapture and recycle systems. “I think what we do is pretty cool.” Gary ensures that operations run smoothly and that each job strictly complies with best practices. He deals with customer service, schedules jobs, and oversees operations both at the office and at job sites. A Seattle native, Gary is an ex-NFL football player, but don’t let his size scare you, he’s a Teddy Bear!
Jorge Najera
Jorge joined Mr Truck wash back in 2008 and was an intricate part in its success. His hard work and dedication to quality and environmentally friendly cleaning has enables him to move up in the ranks of management. Jorge spends most of his time overseeing quality control and environmental compliance.
Jackson Muller, Operations & Fleet Services
Jackson Muller represents the next generation of leadership at Mr. Truck Wash, with hands-on experience in mobile fleet washing operations and day-to-day field execution. Having grown up around the truck washing business, Jackson learned early that this industry is built on consistency, speed, and doing the job right every time.
Jackson works directly with crews, equipment, and customers to ensure fleets are cleaned efficiently, safely, and on schedule. His focus is on execution—making sure wash processes are followed, quality standards are met, and customers get exactly what they’re paying for without excuses or shortcuts.
With a strong understanding of modern equipment, detergents, and workflow optimization, Jackson helps bridge old-school work ethic with newer, more efficient systems. He plays a key role in maintaining service quality while supporting growth as Mr. Truck Wash continues to expand.
Jackson takes pride in keeping fleets clean, compliant, and road-ready—because in this business, reliability matters more than talk.
