Clean Grout With a Bleach Pen
For tile walls, try using a bleach pen to transform your grout from grungy to great. This method is tedious, but the payoff is crisp, clean grout lines. Use the pen to “draw” bleach across the grout lines. The pen allows you to target the grout without getting bleach all over the tile. Wait 10 minutes and then rinse.
For really mildewed grout, you may need a second application, and it can help to gently scrub the bleach into the grout with a toothbrush before allowing it to work for 10 minutes. Make sure to run the fan in the bathroom and to avoid skin contact. This method is best for light or white grout. If you have colored grout, test a small area first. It might fade.
Remove Tough Grime With Less Scrubbing
Whether it's built-up soap scum on the shower walls, ground-in dirt on the floor tile or dried toothpaste on the vanity top, a Magic Eraser sponge (or other brands) will make short work of it. Just dampen it and rub it on the offending mess. In most cases, the mess will come right off. These sponges are especially useful for removing ground-in dirt from porous floor tile and getting those pesky nonslip strips in the bottom of your tub clean.
Magic Eraser sponges are available at grocery stores, hardware stores and wherever cleaning supplies are sold. Unlike regular sponges, they wear out pretty fast, so stock up.