What is an effective way to prevent moss and algae from growing on our brick retaining wall?

Question

Also, what is the best detergent to use in a power/pressure washer?

Answer 1

Bleach me please...........mix with water and use a pump can sprayer.......or just brush it on........give it a little time ....if you want it fast .......get a pressure washer..........easy on the pressure.........good luck

Answer 2

Probably because the wall faces North and is more prone to the least sunlight, you can use a product called Round Up and mix it with water in a sprayer and spray liberally. But you first need to use a wide 3" putty knife and scrape off as much as possible then hose rinse the wall and follow up with the Round Up.

For presser washers you need something that is a low sudsing and is usually sold in the same area where power washers would be sold. Using anything else like dish soap or laundry detergent is going to cause suds to build up and cause the washer to not pick up the water.

Answer 3

Cheap laundry detergent, big scrub brush and a bucket. Scrub the detergent in, vigorously and rinse. We do it every spring on our cement retainer walls and it works like a charm. Walmart sells bags of detergent for like 5 bucks and cheap scrub brushes.