Using Baking Soda to Clean Grout?

I just recently cleaned my shower with a baking soda/water paste, slap it on and scrub with a toothbrush, rinse off. Worked really well!

I have never used baking soda to clean grout. I always use a commercial product that you can buy at a local janitorial supply.

Cleaning Grout is a three step process, clean, brighten and seal. This will give you longer lasting results.
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Make a paste of baking soda & white vinegar. Apply & let sit. Repeat if needed. Also works to clean stainless steel. Good luck.