Overtime with improper care or maintenance grout lines can turn ugly and very soiled just like the grout lines in this picture, actually the real clean color of this grout lines is a light beige. Most of the soiled in the grout lines has been pushed into them by an improper cleaning process and cleaning tool. But don’t worry they can be cleaned thoroughly by an iicrc certified cleaning service like ours, after cleaning a grout sealer is applied to slow the re-soiling. Ask about grout sealing.