What is the best way to get mold off grout?

tilex works great.

Hi Nancy, I've found hydrogen peroxide, baking soda and vinegar work well.

Baking soda is a stellar lifting agent. To make a paste that you can spread over mold to lift it, stir together 1/2 cup of baking soda and several teaspoons of water. Adjust the combination until you have an easily spreadable consistency. Apply the baking soda paste directly over the moldy grout, let sit for 10 minutes, then scrub the mold away with a bristle brush. Rinse with water, and repeat as needed.

http://www.hometalk.com/categories/cleaning/household/grout

Steam clean the grout. On a home steamer there is usually a brush unit that attaches and takes care of grout well.

Baking soda and vinegar paste...

Baking soda, plus vinegar and water. Use the vinegar first, clean then wipe. Then use the baking soda and water as a paste. Rinse. If you need more, you can use hydrogen peroxide.

http://www.apartmenttherapy.com/how-to-clean-grout-138432