Street artist Paul Curtis uses a method contrary to his peers when creating his work – he cleans. Inspired during a stint working in a kitchen, he found a beautiful contrast in the clean versus dirty surfaces, and realized he could transform this chore into artistic forms. Clorox’s Green Works and Curtis teamed up recently to produce a striking mural in San Francisco’s Broadway tunnel.

More info, pictures and videos see the Reverse Graffiti Project official page.