Woolite Foam Carpet Cleaner - Sprays out in foam stream so you can spray right on grout line. Let set several minutes, brush, wipe away. Easiest way ever to clean gross grout! Hmm might try this at the new house, don't know if my grout is colored or just gross :/
Keep one in the shower filled with a mixture of half vinegar and half Dawn dishsoap. Use it to wipe down the shower while you are in there and your shower will always be clean…..I bought the type with the brush cause sponges are gross. After two weeks of having this in the shower I can vouch that it works- and cleaning the shower is way less annoying.