Management Team

liz-aaronAaron Muller, President

Aaron founded Mr. Truck Wash in 2008. Previously he had owned and operated a mobile truck wash company from 1992 and then sold it in 2000. His passion for the industry never subsided and after watching the industry lack growth in practices he witnessed a huge need for quality washing and legitimate waste water management. Aaron helped develop innovative, proprietary equipment that recaptures and recycles water during the onsite truck washing process. Aaron sees green business as a calling. An entrepreneur since the age of 18, he zealously merges the practical and idealistic at MTW.

pic-mayumiMayumi Muller, Vice President of Business Development

Mayumi has been with MTW since 2012. She meets with potential clients and educates them about our unique methods and the results they can expect from our services. She focuses on businesses who are concerned about the environment and introduces them to MTW’s eco-friendly techniques and equipment. Mayumi is all about providing exceptional service and communication. MBTI certified and formerly a business development rep. with Sherwin-Williams, a Fortune 500 company, Mayumi joined MTW because she believes in its community-focused, green mission. She enjoys meeting new customers and sharing with them the mechanics and benefits of our proprietary water recapture system and cleaning process. Mayumi believes that small, conscientious businesses can make a big impact in the community and is proud to be part of MTW.

pic-garyGary Oswold, Operations Manager (Truck Washing Division)

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!

pic-darinDarren Sell, Wastewater & Quality Compliance

Darren is our designated Waste Water Compliance officer and has worked for MTW since 2010. He drives around to job sites and makes sure our crews are properly capturing the water per our company policies and environmental regulations. At the same time, he does spot checks on wash jobs to help us maintain a high-quality product for our clients. Educated at Highline Community College and South Seattle Community College.

Try our green truck washing or green pressure washing today!

Get In Touch

  • 27606 16th Ave S

    Federal Way, WA 98003
  • Main Office: (253) 852-4608

    Fax: (206) 260-0101
  • E-mail: