Question: how to get rid of mold on outside porch?
Answer: Thoroughly water any plants near the area where you will be working. ... 
Add ¾ cup Clorox® Regular-Bleach2 with CLOROMAX® to 1 gallon water in the 5 gallon bucket. ... 
Pre-wet the surface to be cleaned with water.
Apply the bleach and water solution to the surface with a scrub brush.