|
Is it plant or moss like or is it more of a cakey buildup? NM do you live near a beach or ocean water if so could be salt.
Odds are it is a moss or mold. In that case you will need to not only use a wire brush but also a liquid mixture that contains an antifungal in it. Would suggest bleach but it may discolor your brick even in a diluted form. May wish to try some lysol.
My kind likes brick, good place to get spores into and grab on.
|