While I work hard to keep my bathroom pristine, the tile grout on the ceramic tile floor can often look less than fresh. What to do? Well, it often requires a little elbow grease, and a lot of scrubbing. Here's another tip: don't use chlorine bleach. Chlorine bleach can often discolor grout, so instead, opt for oxygen bleach. And since oxygen bleach breaks down to oxygen and water, you can count this bleach on the more eco side of your cleaning routine.