Mold spots on Porch ceiling
I had black mold in my sunroom, and my solution was to hit it with bleach (mixed with water), then to scrap it off and remove it from the areas. I then hit the area with "Mold Control" from Home Depot (as it helps also prevent the spread of mold. I did this to the effected area plus 1m on either side. Then I painted over it with a mold-proof paint (talk to people in your area who can best advise stuff for your region and colour).

I hope this helps. But importantly, use proper PPE use a mask that blocks that stuff and googles! Be safe man!