I have recently purchased an old house (built in approximately 1900) in the United Kingdom as a renovation project.
The brickwork under the porch has been fairly well protected over the years and is still very clean. However, the brickwork above the porch and around the rest of the house has developed a black staining:
Would I be correct to assume that this staining is simply from rain?
In the coming weeks the house will have a scaffolding for other works and so I was hoping also to deal with this staining at this time.
Do you think it would be possible to restore the house brickwork to the original colour (as seen below the porch) and if so, what method(s) would be suitable to obtain this?
Thanks in advance
Best Answer
Bleach works well . I dilute it 50 to 65 % and spray on red brick and concrete drive way. In my warm humid climate ,the brick gets green algae and some dark mold every year ( I usually need to spray only about 5% of the brick). The driveway gets dark ,apparent mold , and needs 100 % coverage. I use a 3 gallon hand pump garden sprayer. It will reach up about 20 ft.