I have white limestone on my house. The north side that is not under my porch has a lot of what I assume is black mold. What is the best way to clean this rock without damaging it?
I also have some pillars of limestone on my entrance that have a lot of black on them too. Looks like crap.
Help.
I also have some pillars of limestone on my entrance that have a lot of black on them too. Looks like crap.
Help.