About Us

About Extreme Clean Group

Extreme Clean Group is a trusted leader in environmental cleaning and specialized remediation services across Ontario. We focus on the challenging, hazardous, and highly sensitive cleanup and restoration work that most companies are not equipped to handle. Our team serves residential and commercial clients with compassion, expertise, and strict health and safety standards.

We operate in Ottawa, London, Kitchener Waterloo, Hamilton, and the Greater Toronto Area. Our certified technicians are trained to manage complex situations from start to finish. We restore properties from biohazards, heavy contamination, hoarding, trauma scenes, and environmental damage, ensuring the space is safe and livable again.

Our Mission

Our mission is to restore safety, dignity, and peace of mind during some of life’s most overwhelming moments. We believe every client deserves care, compassion, and a fresh start. We are committed to delivering high quality results while protecting the health of both our clients and our team.

Meet Our Owner

Dean Lemens

Owner and President, Extreme Clean Group

With more than 20 years of experience in restoration, remediation, and biohazard response, Dean leads Extreme Clean Group with a hands on approach that prioritizes safety, empathy, and expert technique.

Dean holds multiple advanced and top level industry credentials including:

Triple Master IICRC Certifications
• Master Fire and Smoke Restorer
• Master Water Restorer
• Master Textile Restorer

Additional Certifications and Training
• ABRA certified
• ACAC Certified Residential Indoor Environmentalist (CRIE)
• OCT, AMRT, FST, HST, WRT, AMD, CCT
• Extensive biohazard remediation training and response experience
• IPAC (Infection Prevention and Control) training
• Type 3 Asbestos Supervisor certification

Dean has built a reputation as a trusted expert in extreme cleaning and complex remediation projects. His commitment to professionalism and compassion is the foundation of the company’s success and the reason families, property managers, and professional partners continue to rely on Extreme Clean Group across multiple regions in Ontario.