I have what appears to be black mold growing on my porch ceiling. What is your recommended method for correcting that problem? The ceiling is white.
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!
If the mold is coming from humidity in the air, I would kill the mold with a 1:10 chlorine bleach solution and water, undiluted white vinegar, or use a commercial product made for killing black mold. Rinse, let it dry, and don't worry about stains. Use Kilz paint primer to paint over the stains. It is a pretty good product and covers over mold and other stains, including cigarette stink, cat/dog pee on floors, and numerous other sources of nastiness. Finish by painting with the appropriate paint of your choice.
If the mold is a result of a moisture leak from the roof above, you have a bigger problem. You will need to repair the roof first, then use the above method to get rid of and cover the mold.