How to safely clean and remove mold from an exterior brick patio wall?

Mix 1/2 water into 1/2 vinegar. Stir or shake vigorously. Pour into spray bottle and spray all over the wall, let sit and soak 30 minutes to an hour. Spray again and use a coarse brush. The mold should all come off. I sprayed mine again to be sure all rhe mold was gone.

I would suggest using a power washer to make it the easiest and fastest way, but you could scrub it with bleach water while wearing protective gloves and mask if you don't have access to a power washer.

Thanks so much, we do have a power washer. I’m allergic to bleach so I will try using the vinegar and water solution Mona suggested plus the power washer.

cleaning vinegar equal parts water. put in a spray bottle shake to mix. spray moldy spots. bleach may kill the mold, but mold is spread by spores and bleach doesn't get the spores dead.

Thanks so much. Good info and I’ll try the vinegar and water mixture.