Contact News My CSU Work at Sectors Services Innovation Sustainable Hospitality About CSU News Quotation Home > Sectors > Hotels > Green Key Green Key Many hoteliers value 'Green Key': the international quality mark for companies that are serious and verifiable about sustainability, CSR and care for the environment. We are happy to help you to obtain or keep this 'Green Key'. For example, we only work with cleaning agents that are biodegradable and that guarantee the safety of the user, and that all equipment has been tested. If desired, we can provide you with the Green Key manual and the accompanying certificates. OVERVIEW Home Sectors Services Innovation Hospitality About CSU News and Press Careers Disclaimer Privacy policy Cookie statement Sitemap Information Copyright © CSU 2019 SUBSCRIBE TO THE NEWSLETTER Want to stay informed about news about CSU? Sign up for the newsletter. To register SOCIAL MEDIA facebook.com twitter.com linkedin.com youtube.com instagram.com CONTACT CSU BV Uden (head office) Amsterdam Apeldoorn Barendrecht Breda The Hague Eindhoven Groningen Houten Maastricht Email: info@csu.nl King William I Price Named Top Employer 2021 No. 1 facility service provider Voted No. 1 partner in cleaning